A cell is <span>the smallest structural and functional unit of an organism. It effects the body by making and strengthening tissue, fighting unwanted cells, and by giving off oxygen throughout the body.</span>
It is because of the different neurotransmitters and their receptors.
Sympathetic stimulation of arterioles in skeletal muscle is mediated by epinephrine acting on its β-adrenergic receptors.
Sympathetic stimulation of vasoconstriction occurs as a result of activation of α-1 adrenergic receptors by norepinephrine released by post-ganglionic sympathetic neurons.
Plants get their energy from the sun using Photosynthesis and animals get it from eating food.
The answer is b I'm positive
pls give brainliest answer
Answer:
The air
Explanation:
the air has a component of 79% of nitrogen gas (N2)
