Apolyethylene molecule is made of ethane a. atoms b. monomers c. polymers d. proteins

What must happen before meiosis can begin? a. four gametes must be produced b. the four tetrads must be pulled apart c. dna doubles and produces sister chromatids d. the cell membrane pinches together

Jane has a sprained ankle, and her doctor gave her a prescription that states: “ibuprofen caps 200 mg tid po.” what does this prescription say, in spelled-out form?

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.