What are enzymes made from

Why does one part of earth experience summer while another part experiences winter?

The rate of soil erosion depends on?, A climate, B slope steepness, C the type of vegetation, D all of the above

What organelle is considered to be the powerhouse of the cell and where respiration takes place?

What property did Mendeleev use to position the elements on the periodic table? State the periodic law.

Why must the use of pesticides be carefully controlled?

Suppose you look at a microscope to look at a cell from leaf of a tree. What structure will you see that would not be found in a cell from you finger nail. A) cilia B) mitochondria C) ribosomes D) chloroplasts

Write the equation for photosynthesis using both words and the chemical symbols

Which change shows a tenfold increase in concentration of H + ions?

Which valve prevents backflow into the right atrium?

The biomolecule described is a