A species that influences the survival of many other species in an ecosystem is called a(n)

Which part of the neuron below is indicated by the arrow, and what is its function? hormones send chemical signals throughout the body to regulate other body processes. hormones are chemical signals that are sent throughout the body to regulate other body processes. hormones send electrical signals throughout the body to regulate other body processes. hormones are electrical signals that are sent throughout the body to regulate other body processes.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.