Explain how it is known that the environment changed over time.

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

Forces that are equal in strength but opposite in direction are a.) balanced b.) unbalanced c.) always result in motion d.) do not exist

Ascientist and her team counted 200 individual deer in an area of 10 square kilometers. what is the population density?