How many genes make up the human genome?
four adenine, thymine, guanine, and cytosine
23 pairs of genes
20,000-25,000 genes
3 billion genes

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm