Answer:
abiotic basically means NON LIVING (like water,soil, air)
so.. earlier like thousands of years back there was no life on earth thus it is said that earth was abiotic
but later on biosphere arrived through maybe cynobacteria...
Answer:
A. The process of reciprocal inhibition.
Explanation:
In our body, not all the muscles contract and relax simultaneously. The muscle supporting certain reflex are contracted while the others need to be relaxed at that time. In the process of reciprocal inhibition, when a message of contraction is sent by the central nervous system to the agonist muscles, the tension in the antagonist muscles is inhibited by the impulses from the spinal interneurons so that the antagonist muscles get relaxed simultaneously and the reflex action can be completed without causing any damage to our muscular system. If both agonist and antagonist muscles will contract and relax simultaneously, there may be tear in the muscles that's why reciprocal inhibition is a important phenomena occurring in our body.
The correct answer is:
<span>Older glaciers have longer ice crystals than younger ones</span>
The structure that surround and protect the cell depends on the cell type: for plants cells it would be a cell wall whereas for an animal cell it would be the cell membrane :)