What method would produce disease resistant cattle in the shortest amount of time?

a.) genetic engineering
b.) gene therapy
c.) natural selection
d.) selective breeding

(giving out 25 points+brailiest, follow on twitter, and music. ly)

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?