The Earth<span> is unlike every </span>other planet<span> in the Solar System in a number of </span>different<span> ways. It is the only </span>planet<span> that has an atmosphere containing 21 percent oxygen. It is the only </span>planet <span>hat has liquid water on its surface. It is the only </span>planet<span> in the solar system that has life.</span>
Am amniotic egg is first developed in the reptiles.
The membrane and shell make a protective membrane that can provide a safe environment for the cells to divide, and embryo to develop. Animals having an amniotic shell are called as amniotes. The other body parts develop later on.
There are four general conditions that must be met for natural selection to occur, these are: variation among organisms of the same species, large production of offspring, variation in individual fitness among members of the same species and variation in heredity. So from the question given above, the conditions that are required for natural selection are option A, B AND D.