Using energy is the answer to this question :)
The correct answer is D: I and II only.
Viruses have protein capsids, which protect their genetic material. This capsid sometimes is covered by viral envelopes which have glycoproteins on their surface. Glycoproteins help in the process of binding to the host cell and infecting it. In this example, virus III has the structure of a bacteriophage and it does not seem to have glycoproteins. Bacteriophages use their tail fibers to attach to the bacterial host and inject their genetic material. On the contrary, viruses I and II have glycoproteins sticking out of their envelopes.
<span>Early pre-cambrian period the atmosphere consisted only of nitrogen and carbon dioxide without oxygen.
<span>A
Prokaryotic cell does not contain a nucleus. It only contains one
chromosome and is a single-celled organism. It was the only form of life
on earth for millions of years. Examples of a Prokaryotic cell are the
different types of bacteria present today.
</span><span>Autotrophs
obtain energy by the process of photosynthesis. Any living organism
need energy to survive and autotrophs are no different. Two types of
autotrophs are present and they are Photoautotrophs and Chemoautotrophs.
The Photoautotrophs rely on the energy produced during the process of
photosynthesis and the Chemoautotrophs get their energy from most of the
inorganic substances. Phtoautotrophs actually get their energy from the
sunlight and then convert it into reusable form. In case of
Chemoautotrophs ammonia is an important source of energy for them.</span></span>
