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Primary consumers are those that are herbivorous - they only eat producers. Primary consumers are the link between the base of an ecosystem's chain food - where simple substances are transformed into organic compounds by photosynthesis or chemosynthesis - and the upper layers - where energy is obtained from, mostly, other animals.
If primary consumers were not found in an ecosystem, all other layers of the chain food on that ecosystem would be nonexistent. The ecosystem would only be made by producers.
All of the following will need therapeutic cloning technology which is why option D was chosen.
<h3>What is Therapeutic cloning technology?</h3>
This is the process which involves creating a cloned embryo to produce embryonic stem cells which has the same DNA as donor cells.
This is used for the treatment of different forms of disease or serious forms of injuries encountered by individuals.
Read more about Cloning here brainly.com/question/1444102
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