Could life as we know it exist on earth if air contained only oxygen

Mast cells play what key role in initiating an immune response? A. Releasing histamines B. Creating antigens C. Clotting wounds D. Creating antibodies

What is the difference between a predator and a parasite?

How long does a bird live

What is the biological significance of the elephant graveyard in the movie "The Lion King"?

What's a variation biology meaning

How are messages carried in neurons

A change in the sequence of bases in a dna molecule is most accurately referred to as

How many neurons are contained in the brain?

Explain what the word in in each set have in common. Wells, Dams Aquifer, water table

Which situation allows for evolution during gene duplication? A. Existing genes are copied over generations. B. The original gene performs the same role as the mutated gene. C. The original gene NEVER duplicates. D.