Which phrase describes estuaries?

are made of fresh water only
are areas where rivers flow into lakes
are homes to unique plants and animals
are places where all of Virginia's water drains

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.