The membranes of neurons at rest are very permeable to but only slightly permeable to

What did the first language sound like

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.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above