proteins or channel proteins are used to aid substances across the cell membrane in passive transport

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

List two modern organisms that have pentameral symmetry

Which statements describe resources? one of the factors people use when deciding where they will live is the availability of resources. renewable resources have little value for people. resources are unevenly distributed throughout the world. energy is the world resource which has the highest use. the use of nonrenewable resources has decreased in recent history. the use of resources is evenly distributed throughout the world. the world's oil supply will last for the next forty years if its use continues as expected.