Billions of years ago, Earth's atmosphere lacked free oxygen.
Scientists call this a highly toxic atmosphere.
<h3>What kind of atmosphere was present on Earth in early times?</h3>
In the atmosphere of the primitive Earth there was no oxygen (O2) and nitrogen (N2), the air being composed of gases such as
- methane (CH4)
- ammonia (NH3)
- hydrogen (H2)
- and water vapors (H2O).
With this information, we can conclude that Early Earth's atmosphere may have been as toxic as that of Venus today. Earth is the only planet that harbors life (as far as we know)
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Answer:
cross breeding
Explanation:
- the gene of the f2 with red eyes was transferred to some particular offspring and those with pink eyes also and vice versa .example,
- Py Py rY rY
Py (Py Py) (Py Py) (Py rY) (PyrY)
rY (PyrY) ( PyrY ) ( rYrY ) (rYrY )
Answer:
The increase in the average beak depth caused by both an increase in large-beaked finches and by a decline in small-beaked finches
Explanation:
The increase in the average beak depth is caused by both an increase in large-beaked finches and by a decline in small-beaked finches. All the small-beaked finches got disappeared. As a result, only large-beaked finches were left. The drought decreased the number of seeds such that large-beaked finches could eat the larger seeds to survive.
Answer:
A. They do not use up any energy finding mates.
Explanation:
The asexual reproduction consists of one parent which are same to each other while on the other hand consists of two parent that produced unique.
For species survival, the reproduction of protozoa asexually rather than sexually could be better when they don't use much time and energy for determining the mates
Therefore in the given case the correct option is A.
Organelles exist within cells, which exist within tissues. Communities exist within ecosystems, which exist in the biosphere.