HELPPP PLZZ :/ Where do fossil fuels come from?

They have been here ever since Earth was formed

They are the remains of ancient plants and marine microorganisms that have been subjected to a lot of heat and pressure over time

They are created by chemists in a lab

They are all mined from under the sea

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

List the path of the respiratory system