Can someone explain it or maybe give me the answer, im desperate :)

Ascientific idea becomes valid when it is what?

The recycling of water from the ground via runoff or transpiration through plants back into the atmosphere is known as part of the question 6 options: hydrogen cycle nitrogen cycle transpiration water cycle

Explain the physiological changes that occur when the hypothalamus stimulates the sympathetic nervous system. you can make a flowchart or a simple step process. be sure to include all chemicals/hormones secreted, glands involved and the functions of each chemical/hormone.