In response to a stimulus a brain cell called a neuron will send a signal to the brain using
a). electrical signals and chemical neurotransmitters
b). myosin and actin
c). contraction and relaxation
d). respiration and absorption

Ryan rears sheep for their wool. recently the quantity of wool that ryan gets has diminished. this is because the new sheep are not that wooly. ryan should add which nutrient to their feed so that the sheep becomes more wooly? a. cornb. ironc. cottonseedd. vitamin a

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

In which layer do organisms on earth love?