Why is rare to find fossils of animals from before the Cambrian period?

A mucus membrane forms the

Sharks have internal fertilization.

Which of the following best describes pollution discharged by cruise ships? a. Cruise ships only discharge sewage and liquid wastes. b. Cruise ships discharge sewage, solid, liquid, and air pollution. c.

Which type of reproduction will result in genetically identical offspring?

suppose that scientist discover a planet orbiting a star within its life zone what else might scientist want to knowbefor concluding that this planet could support earth like life forms

Whats medical term for state of a fast heart?

The mathematical symbol for period is ОА. Т ОВ. А O co v OD. f

A rock is classified as

Which of the following types of compounds is unlike the other three A - Wax B - Saturated fat C - phospholipid D-polysaccharide

What predictions can researchers make based on the egg viability hypothesis?