Which of the following elements is/are represented in the spectrum below? A. Hydrogen only
B. Helium only
C. Hydrogen and helium
D. Calcium only

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

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