What has more gravitational pull 10kg to 30kg or 30kg to 30 kg

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

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.

Several billion years ago which gas was the least prevailant in the atmosphere