Why is a rocky substrate necessary for coral reef

One of the largest seafood exporters to the united states is a. china b. brazil c. mexico d. saudi arabia

Will mark branliest. the theory of plate tectonics was developed with the contribution of scientists from many different disciplines. which of the following is a contribution from geophysicists?

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a.passive diffusion b.facilitated diffusion c.active transport d.pinocytosis