What is the ultimate source of energy for all living things? A. Food B. The sun C. Water D. Oxygen​

B, The sun.

Explanation:

The Sun is the major source of energy for organisms and the ecosystems of which they are a part. Producers, such as plants and algae, use energy from sunlight to make food energy by combining carbon dioxide and water to form organic matter. This process begins the flow of energy through almost all food webs.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.