Question

the brahman cattle have good resistance to high temperature, but its meat is poor and tough to eat. the english shorthorn cattle, on the other hand, have good meat, but poor resistance to high temperatures. scientists formed the santa gertrudis cattle by breeding brahmans with english shorthorns. this new type of cattle has good meat and resistance to high temperatures. this is an example of a inbreeding. b natural selection. c selective breeding. d genetic engineering.

Explanation:

• Inbreeding involves breeding closely related individuals. Here, it's breeding different types (Brahman and English shorthorn), so A is wrong.
• Natural selection is a natural process where organisms with favorable traits survive. This is a human - induced breeding, not natural, so B is wrong.
• Selective breeding is when humans breed organisms for desired traits. Scientists bred Brahmans and English shorthorns for good meat and heat resistance (desired traits), so C is correct.
• Genetic engineering involves directly manipulating genes at a molecular level. There's no mention of gene manipulation here, so D is wrong.

Answer:

C. selective breeding.