Neurotransmitters: Group of answer choices are chemical messengers that are secreted into the bloodstream primarily by endocrine glands. are present in extremely small quantities in the brain. are constantly changing their basic molecular shape as the human brain adapts to new experiences. compete with sodium and potassium ions for the receptor sites on the surrounding neurons.

Which best compares habitat and niche? o niche is a place in which organisms live, and habitat is the way in which an organism fits into its habitat. o habitat is a place in which organisms live, and niche is the way in which an organism fits into its habitat. habitat is a group of organisms that live in an area, and niche is a specific species that lives in that areao niche is a group of organisms that live in an area, and habitat is a specific species that lives in that area.

Will give ! ! widentify the advantages and disadvantages of renewable and nonrenewable energy resources.

Which statements best describe monsoons? check all that apply. they force cool, moist air from oceans to rise. they are winds that blow in the opposite direction of a normal wind. they bring rain in the summer and drought in the winter they increase rainfall in south asia, africa, and australia. they influence precipitation as wind moves near a mountain.