17. According to the heterotroph hypothesis, heat was necessary for life to develop in the oceans of the
primitive Earth because
A) energy is needed to form the bonds used in the
synthesis of organic compounds
B) autotrophic organisins need heat to synthesize
inorganic compounds
C) primitive enzymes require high temperatures to
function
D) high temperatures are necessary for
reproduction to occur in aggregates

Did you know that a blue wales tongue weighs more than an elephant?

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed

Which feature of a human community is similar to a niche in a biological community