Please help :)
1: Catalysts lower the activation energy of chemical reactions. How does this benefit the environment?

2: Chlorine free radicals are produced in the upper atmosphere when ultraviolet radiation interacts with chlorofluorocarbons (CHCs). The free radicals catalyze the conversion of ozone to oxygen. How is this catalysis harmful to humans

1. By using less energy, reactions that are catalysed are also more sustainable, and therefore better for the environment.

2. By catalysing the conversion of ozone into oxygen, the ozone layer sees a reduction, also reducing the amount of protection from direct UV rays given to humans and other forms of life by the ozone layer.

a. they must be certified by the avma.

explanation:

mark brainliest and have a great day!

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.