Answer these questions fast : - 1.what scientist has popularized the concept of biodiversity? 2.which chemical is used to make rain coats? 3.the organism which is considered as the first formed in the world is? 4.the bird that migrates from one place to another is n longer able to perform what? 5.write the formula for the chemical used for cooling in refrigerator? can anyone answer this and fast . quickly, i need it now.

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)