Which is the biggest disadvantage of using adult stem cells for medical treatments a. they are not very healthy
b. they have more mutation
c. they are totipotent
d. they are not pluripotent

In natural selection, what is actually “selected? ” a) alleles are directly selected b) genotypes are directly selected c) phenotypes are directly selected d) entire populations are directly selected

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism