What is the function of the interdigital membranes in frogs? Do all frogs posses them? Explain.​

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Brainlest awardhow does smoking and arterial plaques increase the risk of hypertension? (2 points) select one: a. both increase blood volume. b. both decrease blood volume. c. both expand the diameter of the blood vessels. d. both constrict the diameter of the blood vessels.