GENETICS AND EVOLUTION
EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Which of the following statements about the effect of early organisms on Earth’s environment is true?
|
|
The first photosynthetic organisms caused Earth to cool as they converted oxygen to carbon dioxide.
|
|
|
The first photosynthetic organisms caused Earth to cool as they converted carbon dioxide to oxygen.
|
|
|
The first photosynthetic organisms caused Earth to heat as they converted oxygen to carbon dioxide.
|
|
|
The first photosynthetic organisms caused Earth to heat as they converted carbon dioxide to oxygen.
|
Explanation:
Detailed explanation-1: -So the correct answer is “Cyanobacteria".
Detailed explanation-2: -Earth’s earliest climates, before 4000Ma, reflected a relatively faint young Sun and a soupy greenhouse atmosphere rich in dust and gas, such as CO2 and NH3, generated by asteroid impacts, magmatic degassing, and high radioactive heat flux.
Detailed explanation-3: -Choice (c) is correct. The products of cellular respiration are carbon dioxide and water, which are the raw materials for photosynthesis.
There is 1 question to complete.