Meiosis stages: do you know the stages the nucleus is intact, the stage the chromatids are attached, and the location of the centrioles?

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above