How it is possible that the same neurotransmitter, acetylcholine, causes different effects on voluntary skeletal muscle tissue and cardiac muscle tissues. (discuss changes in membrane potential (hyperpolarization vs. depolarization), and how that change occurs (what ions are flowing and in what direction).

Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

Eutrophication caused by human nutrient pollution.

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above