NIDDK, NIH
Along with having smooth edges and lacking organelles, red blood cells are also specialized to have a concave shape. How does the
shape of a red blood cell help it to perform its specific function in the human body?
A.
This shape increases the surface area of the cell, which allows it to bind and transport oxygen more easily.
B.
This shape decreases the volume of the cell, which allows the cell to cross semipermeable membranes more easily.
c.
This shape increases the volume of the cell, which allows it to store more carbon dioxide for transport.

This shane decreases the surface area of the cell, which makes the cell less susceptible to infection.

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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