Biology - June 2007

2007-06-01 06:12:08 · 17 answers · asked by halima s 1

My question is asking if any scientists have ever actually observed the traits of a cell through the DNA structure to really see if mircroevolution has occurred(Yeah I know people say microevolution occurs all the time but how exactly has that been checked?). An example would be to observe an offspring and compare it to the parent DNA. If the offspring had any changes that the parent did not contain(not counting any loss of information) then that could be considered a form of microevolution right? I know it may be hard to do since alot of "junk DNA" can be hard to identify, but could it still be done?

2007-06-01 05:26:28 · 3 answers · asked by flip 2

What is the largest reservoir of nitrogen on earth?


A.
trees

B.
soil

C.
marine organisms

D.
atmosphere

2007-06-01 05:25:42 · 10 answers · asked by Anonymous

2007-06-01 05:23:36 · 3 answers · asked by Voight-Kampff 3

2007-06-01 05:06:16 · 2 answers · asked by MuLLady * 2

1. Which trophic level contains the organisms that are the source of all chemical energy used in an ecosystem?
A.herbivores
B.producers
C.decomposers
D.parasites

2.Which statement best describes how organisms use nitrogen?
A.Animals absorb nitrogen from the air they breathe and incorporate it into their tissues.
B.Plants absorb nitrogen from the air in photosynthesis and add it to the sugars they produce.
C.Certain bacteria living in the roots of plants convert nitrogen to a form plants can use, and animals obtain their nitrogen by eating those plants.
D.Certain bacteria convert nitrogen to a form animals can use, and animals obtain their nitrogen by inhaling this nitrogen.

2007-06-01 05:06:02 · 3 answers · asked by Anonymous

it receives about 50 to 100 cm of precipitation per year.

2007-06-01 05:05:51 · 3 answers · asked by jessica_stay 1

1.Which statement best describes the term biodiversity?
A.the total number of different species in an area
B.the total size of a population of a single species
C.the number of communities in an ecosystem
D.the number of trophic levels in a food web

2. Which statement best summarizes the water cycle?
A.As water moves through an ecosystem, its energy is lost between trophic levels.
B.Water in the atmosphere must be converted to another chemical before animals can use it.
C.The water on earth changes forms as it moves from one reservoir to another

2007-06-01 04:59:59 · 5 answers · asked by Anonymous

1. A large geographic area dominated by specific types of plants and animals and characterized by a distinct climate is called __________.
A.a biosphere
B.a biome
C.an ecosystem
D.a biodiversity

2.Which types of organisms recycle the organic molecules of dead organisms at all trophic levels and return their nutrients to the environment?
A.parasites
B.herbivores
C.decomposers
D.carnivores

2007-06-01 04:56:16 · 4 answers · asked by Anonymous

where are all the dinosaur bones and such? If the earth is millions of years old there should be alot more bones. This proves evolution is a scam

2007-06-01 04:29:30 · 10 answers · asked by Real Morgan Jones 2

A. Atmospheric nitrogen is abundant, but not very useful to life. Before it can be used it must be"fixed" and converted to a secondary form.
B. The cycling of carbon, nitrogen, and oxygen involves members of the plant kingdom.
C. Oxygen generally cycles through three different states - solid liquid and gas.
D. Oxygen and water vapor are the two most abundant gases in the atmosphere.
E. Salt water and fresh water move through separate water cycles.

2007-06-01 04:21:27 · 3 answers · asked by jessica_stay 1

Can someone answer these two questions for me?

Why are latin names useful:
1.) for scientists in different countries discussing their work?
2.) when we want to know which animals are related?

2007-06-01 04:02:01 · 3 answers · asked by Anonymous

mine are,
polar bear cubs
emperor penguin chicks
tiger cubs
lion cubs
panda cubs
all the cute, plumpy little birds, except crows, eagles and other scavengers
white puppies
colorful butterflies

in short I love all the animals, especially their babies, the ones that look sooooo cute and adorable.

save wildlife, save nature, save earth. Happy environment day in advance :)

2007-06-01 03:59:05 · 21 answers · asked by Anonymous

you know how for humans, males are XY and females are XX, so the male contribution determines the sex of the child? is it the same way for all other animals (at least those that reproduce sexually), or are there examples where the situation is reversed?

2007-06-01 02:36:39 · 7 answers · asked by Anonymous

2007-06-01 02:27:21 · 7 answers · asked by 7G 1

2007-06-01 01:30:42 · 6 answers · asked by Evan J 2

any vertebrate with hair belongs to the class Mammalia. Is there any other single characteristic that will enable us to place a vertebrate in its class? and what class would an animal having this characteristic be in?

How about a characteristic that all invertebrates have?

Arthropods?




What phylum and class do humans belong?

2007-06-01 01:18:22 · 5 answers · asked by mshoosh33 1