Answer:
Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.
In the discussion listed here, the group discussion that Han most clearly shows is that he is challenging prevailing ideas. This will make the correct answer D.
Answer:
Bacteria
Explanation:
Their cell wall is made of this and they are also unicellular. They eat other things and cannot make their own food
The testes lie between the thighs, in a pair of pouch-like sacs called scrotums or scrotal sacs. The scrotums are outside the main body cavity and thus are at a slightly lower temperature than body temperature.The lower temperature is essential for the sperms to develop properly.
