The first species to live on new land, such as that formed from volcanic lava, are called. ~foundation species =pioneer species ~keystone species ~climax community A symbiotic relationship where both of the co-existing species benefit from the interaction is called .

i think the answer would be d

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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the answer you are looking for is the united states forest service.

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