CFCs can act as greenhouse gases and as chemicals that reduce the ozone levels in the stratosphere. A worldwide ban on CFCs in 1987 was enacted as part of the Montreal Protocol. However, according to the graph, the level of CFCs did not significantly decrease after 1990. Which statement best explains the level of CFCs after 1990?

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

d) center of the mid-ocean ridge

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sinserly,

steckh986

the correct answer is anaphylaxis.

anaphylaxis is a condition caused by insect bites, foods, medications, manifested by tongue swelling, shortness of breath, vomiting, low blood pressure. it sometimes may occur without an obvious reason. it is treated with epinephrine injection.other tretments include antihistamines and steroids,