What is the purpose of water in an ecosystem?

The pneumococcal vaccine is directed against the

Which two groups of organisms contain members that carry out photosynthesis? A.) fungi and plants B.) plants and algae C.) protists and fungi D.) animals and algae

How is the cell a system

When the embryo's cells specialize as components of a particular organ system this is referred to as?

DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase?

An increase in a herbivore populations in an ecosystem will soon lead to

This aquatic area is one of the most productive on Earth. More organic matter is created ere each year than comparably-sized areas of forest, grassland, or agricultural land. This body of water is a (n) A) estuary. B) lake. C) river. D) swamp.

The type of relationship described could best be classified as one of

What term defines a gene made up of two different alleles

Factors that can alter the level of expression of a gene include