Arctic foxes have adapted to the tundra cycles by turning white in the wintertime. Which other tundra animal has adapted the same way? black flies

wild muskox

willow ptarmigan

grey wolf

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101