Which of the following statements is true?

Natural selection is the oldest form of genetic engineering.
Recombinant DNA combines genes from two different organisms.
Selective breeding is controversial because it creates sterile offspring.
Offspring from recombinant DNA are genetic copies of their parent.

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.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Urgent. the table shows the relative blood flow through some organs in the human body that is, the percentage of blood that flows through a given organ, through which organ(s) does all the blood flow? explain the effect of exercise on blood flow to skeletal muscles.