A pure substance that contains the same kinds of atoms with similar physical and chemical properties

The first living thing on planet earth probably looked most like

How is my health influenced by ecosystem services?

Sometimes unique habitats are home to threatened or endangered species. Endangered means a particular animal or plant is sufficiently rare that it could easily disappear from Indiana.

How Many genders Are there?

What part of the cell membrane is not mix with water

Which organisms are prokaryotes a. Archaea b. Fungi c. Protist d. Plants

A population of lizards that originally had no predators lived on a small isolated island. Predators of the lizards were accidently introduced to the island from a visiting ship.

If there are 50 kcal of energy in the tertiary consumer trophic level, how many kcal would you expect to find in the primary consumer level

The plasma membranes of some plant cells use transport proteins to move protons out of the cell against their concentration gradient (from areas of low proton concentration to areas of high proton concentration). this is an example of:

What is algae? and where is come from?