D I believe, that sounds about right
Primary consumers are the ones eating the plants, so mostly they are herbivores, compared to the secondary consumers, which eat both, that can be called omnivores
The biggest challenge is rejection. Sometimes the human body will not accept the pig organ unfortunately.
Hope this helped. Good luck !
Answer for question 1- B (eliminate all plant life)
Answer for question 3- A (Direct energy from the Sun)
(i’m not entirely sure what the answer is to question 2 and i do apologies if any of this incorrect)
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