The large amount of free oxygen in earth's present atmosphere is primarily a result of

The density of ice is actually less than that of liquid water above 4c explain why

What part of a nucleotide determines the traits in organisms

What causes the water currents through the crayfish

Describe the differences between complex and single-gene traits.

Whats kinds of food are proteins found in?

Which two processes result in variations in sexually reproducing species? (1) mutation and genetic recombination (2) mitosis and natural selection (3) extinction and gene replacement (4) selective breeding and cloning

How was the amount of food caught by a heron related to change in biotic and abiotic factors?

Which ecosystem demonstrates the lesser biodiversity? Why?

A particular tissue was discovered to have cells that lie in small chambers, separated by a matrix that is solid yet flexible, and fibers that could be stretched while still being able to return to their original length. Name this tissue.

What does the lac operon in bacteria code for?