What type of experiment is an observational study?

A. In silico

B. In vivo

C. In vitro

D. In utero

Is lung carry out gas exchange a cell, tissue, organ, or organ system

Where is oxygen first used in the transition from anaerobic to aerobic metabolism?

Do autotrophs use cellular respiration

Compare the appearance and function of cilia and microvilli

What materials diffuse in and out of a cell across the cell membrane

what are the dificulties faced by the people in the rural areas to get portable water. explain in easy tearms

What is the significance of tropism in plant life?

If this site was made by students shouldn't it be a non-profit type thing?

In what form will Susan be able to capture that phosphorous as it is released from the sedimentary rock? phosphorous granules phosphate powder soluble phosphate soluble phosphorous

From what specific substance in air does most of the mass of sugar come from