In sedimentary rock from over 2.7 million years ago, the presence of cellular membrane components indicate that at least unicellular life was present in abundance at that time. what biomolecular structure would indicate the presence of a cell enclosed in a membrane in the fossilized rock? a) dna and rna b) lipids and cholesterols c) proteins and nucleic acids d) chloroplasts and mitochondria

Study the diagram of a desert food chain . what would most likely happen if the kangaroo rats were killed off and removed from the food chain ?

What types of energy transfers and energy transportations are involved in the domino chain reaction?

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