7. which human activity will most likely contribute to ozone layer destruction? cutting down trees to build a library using fertilizer to grow bean crops planting flowers that come from another area frequently using an air conditioner in the home 8. the chesapeake bay is an important natural resource. over the years, the number of oysters in the bay has declined dramatically, largely because of fishers who catch them and sell them as food. this has affected many other organisms that depend on oysters. this is an example of which type of short-term human-induced environmental change? eutrophication non-sustainable harvesting nonnative species introduction pollution

7. Option D

8.  Option C

Explanation:

7. The cooling gas being used in ACs release harmful chlorofluoro carbon (CFCs) gas which when interacts with the ozone layer enters into an unstoppable chain reactions thereby deteriorating the ozone layer. Thus, option D is correct

8. This mode of fishing where the oysters are being cached by the fisherman excessively without putting in any efforts to revive their population is called as non sustainable mode of harvesting. In such farming the available resources(i.e oysters)  are used without preserving any part of its population (or without making any attempts to increase population of oysters) for future generation. Thus, option C is correct  

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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.