About 530 million years ago, an evolutionary period known as the "Cambrian explosion" took place. Large numbers of new animal species appear in the fossil record that corresponds with this time. Based on patterns of extinctions documented in the fossil record, about how many of these Cambrian species are probably still surviving today?

A- none of them
B- All of them
C-most of them
D-A very small number of them

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