<u>Answer:
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"An oxygen-rich environment would cause a mass extinction of prokaryotes." Supports current scientific theories of how life might have originated on Earth.
<u>Explanation:
</u>
The reacting power of oxygen increases rigorously in an oxygen- rich environment, which leads to huge fire ignition even with the slightest spark which is generally non hazardous at all. Many prokaryotic organisms do not need oxygen as they perform anaerobic respiration. Oxygen is dangerous for some prokaryotes.
There were some prokaryotic organisms who were giving out oxygen as waste. Such excess amount of oxygen was hazardous for the environment and hence mass extinction was required to keep a check on the excess amount of oxygen being released.
The amber in the Baltic Sea has exposed insects from every region of the planet trapped in it. This can be a nice evidence about the continental drift theory. The continents have been moving for billions of years now. While they are not merged today, an we have multiple separate continents, that has not always been the case. In the past, the continents have all been merged into one enormous landmass, a supercontinent. The name given tot his supercontinent is Pangaea. Since all the continents were merged, thus representing one continuous land mass, the living organisms were able to move all throughout it, including the species of insects as well. As the movement was free, the amber in what is now the Baltic Sea, managed to preserve insects numerous different species of insects, which later, as Pangaea started to break apart, were separated and lived in different land masses as they got isolated from each other.
The special structures of the following phylums:
- Porifera: members of this phylum have special collar cells. They have cellular level of body organisation.
- Cnidaria: members have stinging cells on the tentacles surrounding mouth.
- Ctenophora: members have comb like ciliary plates for swimming.
- Platyhelminthes: For the first in animal kingdom, members of this phylum there is development of sensory and nervous tissue in the head region (cephalization)
Answer:
True
Explanation:
Sunburn (First-Degree Burns): A sunburn is skin damage from the sun's ultraviolet (UV) rays. Most sunburns cause mild pain and redness but affect only the outer layer of skin ( first-degree burn). The red skin might hurt when you touch it. These sunburns are mild and can usually be treated at home.
Near nuclear power plants
uranium 235
solar power
33%
all of the above
mass transit, carpooling
fusion
buried underground