All of the following have an internal skeleton except

a. sand dollars.

b. sand fleas.

c. sea stars.

d. sea lilies.

Explain the adaptive value of a larger body size in a colder climate

Natural selection relies on genetic variation. in any population of beetles there are alleles for brown or green color.

Bacterial spores can survive long periods of time in heat, dehydration, and cold because of their: (a) special enzymes (b) large amounts of DNA (c) specialized cytoplasm (d) thick cell wall.

How do body systems work togther to defend from illness or injury in the human body or in other animals

Outline three ways Henslow influenced Charles Darwin

An education guess or rational explanation about a specific phenomenon

What are the technical name for red blood cells white blood cells and platelets?

What are the resources of the ocean

Which organism actively hunts other

Where does chemical digestion of food take place?