Which of the following is an example of a predator adaptation?
a. a porcupine’s needles
b. a shark’s powerful jaws
c. a frog’s bright colors
d. a plant’s poisonous chemicals

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Which is the graph of the piecewise function f(x)? f(x) = image for option 1 image for option 2 image for option 3 image for option 4

In a population that is in hardy-weinberg equilibrium, there are two possible alleles for a certain gene, a and a. if the frequency of allele a is 0.4, what fraction of the population is heterozygous? a. 0.40 b. 0.60 c. 0.16 d. 0.48