Which reactant in the photosynthesis equation is used directly to make sugar?
O A. Water
O B. Chlorophyll
O C. Light energy
O D. Carbon dioxide

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.

Which type of neuron stimulates muscles to contract?