During which period did fishlike amphibians begin to occupy land

Many people dismiss scientific theories because they are only theories

Choose all the answers that apply. Matter in an ecosystem: must be continuously replenished is part of a closed system is recycled and reused is returned to the earth by decomposers is always decreasing

What are three examples of macroscopic structures?

What trait of living things does the snake display when it changes it location to warm it self

What type of isolation occurs when species mate at different times of the year?

Which is an example of dehydration synthesis? A.) DNA synthesis from nucleotides B.) conversion of proteins into its amino acids C.) conversion of lipids into fatty acids

Making chemical energy from light energy is called cellular respiration. True or false

True or false, in the water molecule, electrons are equally shared by hydrogen atoms and oxygen atoms

What may happen as sediment and decaying organisms build up in a pond

Creatures that are poorly suited to the environment do not generally weaken the entire population because A. The population protects its own B. They often die before they can reproduce C. All populations have some weak members D.