What of the following organisms is located only in the 3rd trophic level of the soil food chain?
a. bacteria
b. fungi
c. protozoa
d. nematodes

The correct answer is option - c. protozoa.

Explanation:

Amoeba and other protozoans are located at the third trophic level of the soil food chain. Nematodes are generally present in the second trophic level but sometimes in the third trophic level also.

Bacteria and fungi have a place in the second trophic level in the soil food chain. Amoeba engulfs bacteria for nutrition.

Thus, the correct answer is option- c. protozoa.

answer; the correct answer is (beta)

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.