How does crossing-over result in genetic recombination? A. It reduces the original cell’s chromosome number by half.

B. It mixes half the maternal chromosomes with half the paternal chromosomes.

C. It randomly separates the maternal and paternal chromosomes.

D. It permits the exchange of genetic material between homologous chromosomes.

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above

26 a medida que cambia el clima, ¿qué tipo de reproducción más probablemente de a una especie mayores posibilidades de supervivencia?