Some butterflies produce bad-tasting chemicals to prevent them from being eaten by birds. other butterflies
have evolved coloration that makes them look like the bad-tasting butterflies. if the mimic butterflies become
too numerous, then the bad-tasting butterflies will lose the protection they get by tasting bad, since most of
the butterflies that look like them taste good to birds, and birds will no longer be afraid to eat them. so, the
coloration pattern of the bad-tasting butterflies evolves over generations so they look less like the mimics.
when two species evolve in response to each other, this is an example of:

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days, followed by 7 days when no hormones are ingested. which of the following statements most accurately describes the effects of birth-control pills? -birth-control pills maintain constant levels of estrogens and/or progesterone so there is no surge in lh and ovulation does not occur.-birth-control pills inhibit the development of the uterine lining so implantation of a fertilized oocyte cannot occur.-birth-control pills maintain constant levels of estrogens and/or progesterones and mask the release of the oocyte from the follicle.-the 7 days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant.