Water that soaks into porous rocks in the ground

What is thought to have caused the mass extinction at the end of the cretaceous period?

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a

In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.