It's now pretty well established that apreviously unstudied fungus (Batrachochytrium dendrobatidis—batrachos is Greek for "froga-or Bd for short) is responsible for the mass extinction of so many frogs. Why hadn't it killed them all before? a. The frogs are more biologically vulnerable because of changes in their skin
b. Radioactive fallout made it more deadly
c. It mutated
d. Boats and planes weren't around​

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

What is the name for a substance formed in a chemical reaction

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.