Which describes a group of organisms that is considered a species?
a. they can breed and produce offspring that can breed.
b. they are members of the same community.
c. they live in the same ecosystem, community, and biome.
d. they have similar physical characteristics.

The right option is; A.They can breed and produce offspring that can breed.

A species are group of organisms in which any two organisms of the appropriate sexes can mate and produce fertile offspring, usually by sexual reproduction. Species usually have a two-part name (binomial). The first part is the genus to which the organism belongs, while the second part is the specific name. For example Felis catus, Felis lybica and Felis margarita are species  of cats of the Felis genus.

answer

crater lake was formed when mount mazama produced a large eruption and collapsed to form a caldera, which then filled with water forming a lake.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.