Which statement is an example of commensalism ? OA Egrets eat insects that are unearthed after livestock graze , but do not affect the livestock OB Wasps lay eggs inside hornworms so that after hatching , the wasp larvae can feed on the hornworm Lions and hyenas both live in a savanna and eat the same prey , antelopes . Otters contribute to a high level of diversity in their ecosystern because they eat urchins , allowing kelp to grow , Ladybugs consume insects such as aphids , mealyworms , and spider mites .

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.