Help please I couldn't find the right answer

Fossils of tropical plants have been found in the Earth's polar regions. How could this be explained?

A. The continent on which the tropical plants lived changed latitudes over time.

B. The fossils are of arctic species that look like tropical species.

C. Seeds from tropical plants were carried to the polar regions by birds a long time ago.

D. Tropical plants were able to withstand much colder temperatures in the past.​

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.