Answer:
In my opinion ...it is option A:)
Oxygen is the answer for this question.
Y is the best options because a secondary consumer will eat a primary consumer for energy (the grass hopper).
Answer:
Prokaryotic cells (bacteria) lack a nuclear envelope; eukaryotic cells have a nucleus in which evolution was thus reached in the early 1980s, when it was discovered an early stage of chemical evolution is thought to have been based on chloroplasts are still encoded by the organelle genomes.
Explanation:
