Please help me match these

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

Plsss > .< compare and contrast the characteristics of flatworms rounds worms and earthworms

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center