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.

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.