Short-spined sea urchin fossils were found directly above long spined sea urchin fossils in a layer of rock. what do the differences between the two sets of sea urchin fossils suggest about them?
a)the longer spines developed as the shorter-spined sea urchins grew older.
b)the longer-spined sea urchins existed before the shorter-spined sea urchins.
c)the shorter-spined sea urchins stretched their spines to ward off predators.
d)the shorter spines did not protect the sea urchins well enough and they died off.
Answers: 1
Biology, 22.06.2019 04:30, dondre54
African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.
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Biology, 22.06.2019 11:00, ayoismeisalex
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