The teleosts are a primitive form of fish. Indicate whether the statement is true or false
F
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Forests that have grown in an area through secondary ecological succession after a human or natural disturbance are called ____________________.
Fill in the blank(s) with the appropriate word(s).
The summer characteristics of a maritime polar air mass is
A) mild and humid. B) cool and dry. C) warm and humid. D) warm and dry. E) very hot and dry.
What happens when fresh water flows into seawater?
A) They mix completely. B) There is a continuous gradation from seawater on top to fresh water on the bottom. C) The fresh water covers the sea water. D) The sea water covers the fresh water. E) There is a continuous gradation from fresh water on top to sea water on the bottom.
Judge the following sentence according to the criteria given below: Sharks have existed almost unchanged in Earth's oceans for more than 400 million years BECAUSE the relatively uniform conditions of the open ocean do not pressure organisms to adapt
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.