Author Question: Why don't fish have spines like the foraminifera to keep them from sinking? a) The drag would use ... (Read 19 times)

jc611 · **on:** Aug 22, 2018

Why don't fish have spines like the foraminifera to keep them from sinking?

a) The drag would use up too much energy in swimming.
b) The fish is too heavy, so the drag would not slow its sinking by much.
c) The drag would hinder the fish from catching prey.
d) Fish don't need the extra surface area of spines to keep them buoyant due to their internal and external structure.
e) A, B, and C

Question 2

What are rare-earth elements, and where are they found in the ocean?

a) An assortment of 17 elements like neodymium used in technology, found in sea floor muds
b) Gypsum and halite used for making casts, molds and sheetrock (gypsum), and as table salt (halite), found in warm shallow water
c) Gas hydrates used for fuels, found on continental shelves
d) Manganese nodules used in modern technology, found near hydrothermal vents