Feeding relationship that exist among organisms

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

Which type of neuron stimulates muscles to contract?