Answer: blood transfusion
Explaination:a routine medical procedure in which donated blood is provided to you through a narrow tube placed within a vein in your arm
The correct answer is option d, that is, neurotransmitters.
A neurotransmitter refers to a chemical component, which is discharged at the terminal of a nerve fiber by the introduction of a nerve impulse, and by diffusing across the junction or synapse. It helps in the transfer of the impulse to another muscle fiber, nerve fiber, or some other composition. Acetylcholine is a kind of neurotransmitter, that is, used by neurons in the CNS and the PNS in the control of activities ranging from heart rate and muscle contraction to digestion and memory.
The answer is greenhouse effect
Answer:
the one with the thickest coat will stay the warmest
Explanation:
Genetic engineering is a big part of agriculture. that would be your answer