7. Explain why the scientific community was slow to accept the asteroid impact hypothesis.

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.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint