<span>They are all enclosed by membranes made of phospholipids.
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This would occur through the process of convergent evolution. This describes the<span> independent </span>evolution<span> of similar traits in unrelated species. Some examples would be the development of a streamlined shape for swimming among fish, penguins, dolphins and seals. The development of wings for flying among birds and bats. And the development of complex eyes among vertebrates and cephalopods. </span>
Answer:
The correct answer is option c, that is, variation.
Explanation:
In the given case, the gravel mix is to be selected on the basis of the size of pebbles, which is analogous to the organism selected in nature. In the given question, the sorting machine is analogous to the environment, that is, a selective force.
Like a specific environment permits the organisms exhibiting specific traits. For example, in a desert where the environment is hot and dry, only the species exhibiting the tendency to conserve water can thrive, similarly sorting machine will permit to distinguish gravel on the basis of the pebble size. Thus, different size of pebble resembles variation.
Healthy couples having regular ,unprotected intercourse have a 20% to 25% chances of a diagnosed pregnancy within a given menstrual cycle.
Answer: The purification gave evidence of the identity of the transforming material, meaning that the possible transforming substance was narrowed down.
Explanation: Removing lipids and carbohydrates suggest that these are not the transforming materials and removing protein suggests that this is also not a transforming material.