Which of the following changes would eliminate the energy source that generates the convection currents in the ocean? O
Stopping the rotation of Earth.
Blocking off all solar radiation.
O
Removing all the salt from sea water.
O
Eliminating producers from marine habitats.

answer: c.

explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

answer: b

coz red blood cells marrow and circulates the body for 120 days.