Nitrogen is an important element in compound such as , DNA, & chlorophyll. Nitrogen is the most gas in the atmosphere. It cycles from the to & back to . But living things cannot use it in its gas form, therefore living things get from the . 1. Living organisms cannot use simple nitrogen molecules (NH2). 2. Living things take it in as a nitrate (NO3-). 3. Nitrate is formed when nitrogen is combined with oxygen. This process is called nitrogen .

Nitrogen is an important element in the living things.

Compounds such as amino acids, DNA, proteins and DNA

Nitrogen is the most Abu can't gas in the atmosphere. It cycles from the atmosphere,to the terrestrial habitat and Marine habitat then back to the atmosphere.

Living things nitrogen from the nitrogenous compound.

Nitrate is formed when nitrogen combine with oxygen and it is called nitrogen fixation.

Explanation:

Nitrogen is an important element in living things and it is important for life processes. It is the major constituent of DNA, protein, amino acids and Chlorophyii.

Nitrogen is released from the atmosphere to the root nodules of leguminous plants or to the soil by bacteria called nitrogen fixing bacteria . Nitrogen can not be absorb in gaseous form by plants because they are unreactive but they are converted to nitrates and ammonium compound.

the answer is

c. parental

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.