Answer:
Pretty sure it's A. Let me know if I'm wrong.
One can consider viruses abiotic is the fact that they can be quite mobile as well as also containing genetic material.
They are abiotic however because they do not use energy, and have no involvement in organic processes, merely being sacs of genetic material.
A) when soils are poor in nutrients, crop yields are low
Could you show me some options if you have any?
Answer:
A
Explanation:
A cell can communicate with nearby cells (paracrine signaling) and with cells far away from them (endocrine signaling). These signalings are dependent on the cell membrane receptors on the cell and their response to ligands that bind to them. An example of close cell communication is that of neurotransmitters in neural synapses. An example of cells communicating with faraway cells is that of the pancreas that produces insulin into the blood. The insulin induces other cells across the body to take up glucose.
I hope this helps and that you have a great day! :)