What is function of capillaries

What on a bird besides its feet is chemically similar to scales?

The substance that enters earth cycles and does harm to living things

Calculate the medullary index of a hair whose diameter is 110 microns and whose medulla measures 58 microns. Is this human or nonhuman animal hair?

Which is these indicates that a liquid has transferred thermal energy to the air

Three kinds of particles that make up most atoms

The plasma membranes of some plant cells use transport proteins to move protons out of the cell against their concentration gradient (from areas of low proton concentration to areas of high proton concentration). this is an example of:

What is algae? and where is come from?

Are mushrooms biotic or abiotic

What type of blood vessels join arteries to veins

Fossils found in a cave at krapina, croatia, show evidence of: a. cannibalism. b. all of the above. c. speaking ability. d. pottery production.