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ScienceNet is a World Wide Web resource database in Science. It is a community service project by Science Centre Singapore, supported by Nanyang Technological University and National University of Singapore.

We offer free electronic access to various topics in Science and Technology. Feel free to browse through our database and see if we have the answers to your questions.

Life Sciences - General Biology
Q20018 :	What is the so-called spontaneous generation?
Q19916 :	The other day I saw a tiny bird about as big as my thumb flitting about my heliconias. We could not quite catch its colour but it has a long curved beak, typical of what is seen on hummingbirds. This has led me to believe that humming birds can be found in Singapore. However my uncle insists that they cannot be found in this part of the world. Can humming birds be found in Singapore?
Q19823 :	Is it true that humans are herbivores and not omnivore? As we humans can't hunt for food in the wild unlike bear which can hunt for their prey as well as smell their prey.
Q19718 :	Does mushrooms have roots?
Q19703 :	Fish tanks usually have a light. Is it better to leave it on the whole night or is it better to off it at night?
Q19652 :	Will human body hair decompose or it cannot be destroy except burning it?
Q19627 :	I rear some fishes at home and I place a few water plants in the tank. Recently, while feeding the fishes, I observed that there are some air bubbles on the leaves? Why is it so? What do these air bubbles contain? Why is it that the air bubbles do not float onto the surface of the water, as air is less dense than water? Thanks.
Q19614 :	I have read ScienceNet question No. 11 on humus. Can you tell me more about it?
Q19539 :	I am wondering what are the optimum growth conditions of fungi especially those found most commonly in the tropical areas. Also what are the common species found in our region?
Q19439 :	Is there living thing that lives forever? Is it true that electron never die?
Q19374 :	What plants and animals live in a pond?
Q19107 :	Why do fungi appear differently in different food and places?
Q18824 :	What is a bracket fungus?
Q18572 :	The weight of some freshly plucked leaves decreased after leaving them in a room for some days. Is the weight change due to transpiration or decomposition or both?
Q18000 :	How does parthenogenesis occur in plants?
Q17084 :	How long have Homo sapiens been in existence on this Earth?
Q16991 :	Does beer make one's stomach bloat?
Q16927 :	I was told that certain soil bacteria produce toxins that are highly valued by organic farmers. These bacteria have been sprayed on crops for more than 50 years as a safe form of biological pest control. Could you please provide more information on this? Thanks.
Q16527 :	What is the largest dragonfly in the world? Where can these dragonflies be found?
Q16459 :	How does fungi grow on plants?
Q14916 :	I know the dragonfly kingdom is Animalia, Phylum is Arthropoda, Class is Insecta, and the Order is Odonata but I can't find what their family, genus, and species are. Can you tell me them? What is dragonfly ingestion? How do dragonflies respond to their environment? (Stimulus and Responses) Thank you so very much!
Q14872 :	I would like to know more about Flora and Fauna. Could you tell me where I could get a guide about it?
Q14852 :	What do water fleas feed on?
Q14795 :	What kingdom do paramecium belong to?
Q14111 :	Is a tapeworm reddish in colour, very thin and has like a zigzag filament inside its body?
Q13999 :	Are mushrooms plants?
Q13960 :	What is the definition of life Sciences?
Q13724 :	What are the names of common weeds found in our gardens and open fields? What type of animals are found along with the weeds and feed on them?
Q12807 :	Does saving endangered species of flora and fauna go against the principles of evolution and natural selection? After all, extinction is all part and parcel of survival of the fittest. By preventing extinction, are there any other disadvantages?
Q12783 :	If the grasses are mowed, how do the grass grow back its leaves? What is the growth pattern of the leaves?
Q11918 :	Why is there a limit to the maximum size a cell can grow?
Q11541 :	Some people say that we are from apes. And some say we are not. Whom do I believe?
Q11091 :	I only recently investigated what blood type I have and found out that I have Rhesus D negative blood. I know that there are some implications associated with having Rh D negative or Rh D positive blood (I don't know which). Could you please clarify for me the particulars of Rhesus disease?
Q10694 :	One of your web pages (ScienceNet Question 5848) mentions that certain orchid species have a "one-to-one pollinator specificity". The genus Stanhopea is mentioned as one of these. What insect/animal is its pollinator?
Q9834 :	How many species of living organisms now exist on Earth?
Q9220 :	How many stages does a dragonfly have? Does the dragonfly nymph shed its skin?
Q9165 :	How long can a dragonfly live?
Q7630 :	Why is it when I put my aquarium in areas where it can receive sunlight the water changes its colour to green?
Q6180 :	Can I have some characteristics of goldfish?
Q5649 :	What are some of the features of mammals?
Q4396 :	What are the roles of pigments in plants and animals?
Q4170 :	I am in the fifth grade and I would like to have some information on archer fish. Could you please help?
Q3925 :	I would like to have some information about pond community. Where can I find it?
Q3891 :	Is hair technically "alive," or is it just the result of dead cells?
Q3518 :	What is the Miller experiment on the origin of life? How does it work?
Q2662 :	Could you please tell me the definition of life?
Q2544 :	Fungi are not considered plants anymore; is it correct?
Q1931 :	What is a single celled animal?
Q1903 :	Why does lactic acid lead to less efficient muscle contraction? Specifically, if applied to Daphnia (water flea), why would lactic acid slow the heart rate?
Q1844 :	Is there any way to produce an animal that is extinct?
Q1779 :	I have found some larvae on a damp sponge (Shower sponge). Can mosquitoes breed on damp sponges other than stagnant water?
Q1526 :	Does the pond skater have wings. If so, how many pairs? Does the draganfly belong to the field or pond community? It can be found near the pond as well as the field.
Q1525 :	Is it true that you can freeze a mouse and bring it back to life?
Q1514 :	Cupid - Love Apple - was it a tomato?
Q1464 :	Do Salamanders make good pets? We heard that they carry Salmonella on their skin.
Q1435 :	Assuming mamals evolved from reptiles which evolved from amphibians which evolved from fish, where did insects come from? Did insects evolve separately on land or did they somehow come from the sea too?
Q1425 :	What is an auxin receptor? Where is it and what does it do?
Q1411 :	Where do sharks live?
Q1401 :	My daughter and I found some egg like substance in our fresh water lake in our backyard. This lake is in western Washington and is mountain fed. How can we ID these eggs?
Q1398 :	What are those insects which feed within the bodies of other animals and live there all the time called?
Q1389 :	How do cow grass reproduce without flowers?
Q1386 :	Why can the nipah fruit float on water without its fibrous husk?
Q1373 :	I thought one difference between the 2 groups: (a) cockroach, house lizard, mealworm (b) hippo, polar bear, whale is that (a) lay eggs and (b) give birth to their young alive. This is because the term "mealworm" is used to describe both the larva as well as the adult beetle. At least, this is what the P5 Science Teachers' Guide notes say. I am told at school however, that "mealworm" refers GENERALLY to the larva (hence are incapable of reproducing) and therefore my answer above is wrong.
Q1337 :	Why are the number of systems found in plants smaller than the number of systems found in animals?
Q1327 :	Has there been scientific proof that aspirin aids in the growth process for seeds? If so, where can I find this information. This is for a biology project on seed germination.
Q1319 :	How do I tell the difference between Vernonia and Cupid's Shaving Brush?
Q944 :	Given the right circumstance, do simple, single-cell organisms spontaneously appear out of inorganic elements? Has this ever been duplicated in a laboratory setting?
Q665 :	What do crabs eat?
Q523 :	What is vegetative propagation?
Q487 :	Do alligators see to the side or do they see straight?
Q486 :	Do pineapples have seeds? I read in a copy of Zoo-Ed that cultivated species of pineapples rarely have seeds. That means some species do have seeds. Am I right? Also, what is the difference between a fruit and a vegetable? Thanks.
Q476 :	What does poison ivy look like?
Q441 :	How do rattlesnakes produce the famous rattling sound from its tail?
Q436 :	Can I know are tomatoes and bananas considered as fruits? What is the actual definition of a fruit? Also, can I know how do you obtain the chemicals found in the smells and flavours of artificial flavourings? Can you also name me a few examples used like in the apple smell and taste?
Q413 :	Why can't man change his skin like snakes?
Q405 :	What will the next century people look like?
Q402 :	Man has been changing since the beginning, from ape-like forms to our present forms. Are we still changing? If yes, what is/are the significant change/s?
Q300 :	Is apple a fruit?
Q294 :	What is the minimum number of organisms that is required to make up a single food chain? Must there be a secondary consumer before a food chain is complete?
Q176 :	What is the term for a specialist in the gastrointestinal systems of the body, if any?
Q128 :	What is a snakehead ? What does it eats?
Q120 :	How did life begin ?
Q117 :	Can blood be genetically produced from our genes ?
Q115 :	Why are there deformed babies?
Q107 :	Which came first, the chicken or the egg?
Q94 :	How do our bodies digest the food we consume?
Q58 :	Why can animals cross breed?

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