Ddt was banned from use as a pesticide in the united states because a. it caused the eggs of fish-eating birds to become thin and fragile. b. it was washed by rain into streams, rivers, lakes, and ponds. c. it was ingested by fish and other aquatic animals. d. all of the above.

b.have there own function.

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.

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds