What indicates that a b cell or t cell has developed immunocompetence?

12. Consider a population of 5000 garter snakes. Two hundred of those snakes split off from the population to a new habitat. When the original population dropped from 5000 to 4800, the allele frequencies of various genes changed.

What human activity is most responsible for the damage to the ozone layer?

How do convergent and divergent cause limbs to envole?

Foods that are low in sodium and rich in potassium include

What farming method is used in dry or desert areas? (A) chinampas (B) drip irrigation (C) wind-powered pumps (D) aqueducts

Animal lays eggs with a tough leathery watertight shell

Why is DNA antiparallel? It has double strands complementing each other. The bases in one strand pair with the other bases in the complementary strand. It has a ladder shape. Its double strands run in opposite directions.

Which of these is a solution, where the solute and solvent are in the gas phase? A) air B) ozone C) brass D) carbon dioxide

The roads in northern states (like Michigan) need to be repaired more often than roads in southern states (like South Carolina). Explain the effects mechanical weathering could have on this?

A substance that form hydrogen ions when dissolved in water is called a?