Which controls on the microscope affect the amount of light reaching the ocular lens?

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

The model illustrates a process by which a substance is taken up by a cell

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth