Dr. ben dantzer, a faculty member here at michigan, studies red squirrels that live in the boreal forest. the boreal forest contains coniferous trees, which produce seeds but not flowers. in his study sites, white spruce is by far the most common tree species, and is a very important food resource for the red squirrels. which of the following can be used to describe the white spruce? (check all that apply)a. heterotrophb. dominant speciesc. primary producerd. angiosperme. autotrophf. cyanobacteriag. keystone species

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

explanation:

idk

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms