Which of the following is a reason to place birds into a class of their own?

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

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

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