Which of the following is true about a spinal reflex? a. it is controlled by the brain. b. it is an involuntary response to a stimulus. c. it is a voluntary contraction of muscles. d. it increases blood flow to muscles.

During a fierce storm a large number of tall trees on an island are uprooted by the wind and die. most of the trees on the island are now short trees and produce seeds that grow into short trees. what concept is shown in this example? question 5 options: natural selection artificial selection genetic engineering gene splicing