Ionic bonds result when electrons are tranfered between atoms. Covalent bondsresult when valence electrons are shared between atoms. You should be able to identify whether an ionic or covalent bond is being formed between atoms.
Rocks,water,pebbles = Abiotic
Fish =Biotic
Answer:
Water levels and mineral salts in the blood are controlled to protect animal cells by stopping too much water from entering or leaving them. The concentration of water and salts is the same inside and outside of the cells. If body cells lose or gain too much water by osmosis, they do not function efficiently.
<span>The ischemic penumbra can maintain metabolic demand with marginal blood flow from collateral circulation for a maximum of 50% before increasing in size. A penumbra is the area where the flow of blood at about 25 - 50% can maintain normal metabolic demands for 6 - 8 hours only. When it continues to increase, the human cells will die and other neurological activity will be suspended causing the person to die slowly.</span>