Answer: The oxygen content at the source of the streams or rivers is higher as compared to the mouth of the river. Consequently, the organisms which require more oxygen tend to find at the source of the rivers whereas the organisms which require less oxygen tend to find at the mouth of the river.
Explanation:
Answer:
C
Explanation:
Active transport requires energy, while passive energy does not.
Yeah owls don’t mainly say boa though
Answer:
The correct answer will be- the planets and moon also exhibit hydrothermal vents, volcanoes and rocks.
Explanation:
Scientists have always tried to understand and explain the origin of life on Earth and predicted that life on earth originated as a result of the conditions created by the distance of the Earth from the Sun.
Later discoveries found that life exists even in the harsh conditions on Earth-like hydrothermal vents and inside sub-surface of the rocks. This shows that life can exist in extreme conditions.
Since the planets other than Earth posses such hydrothermal vents, rocks and volcanoes, therefore scientists predict that life could be found on other planets.
Answer:
A
Explanation:
organisms don't fully decompose and become trapped underground
