Certain corals have been found in extremely deep water. these coral lack the zooxanthellae that are found in tropical coral reefs. what is the most likely explanation for this?

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later.when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

What is called the "building block" of life?

What is involved in redox reactions