Why is having a variety of plants important in an ecosystem? If the secondary consumers do not have enough to eat, the top predators could die out.

If the primary consumers die out, the secondary consumers will not have enough to eat.

If one type of plant gets diseased, the primary consumers that eat that plant may not have anything to eat.

all of the above

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.

Stage in which a typical star has completely stopped fusion

What is the molecular weight of copper