<em><u>A non-contact force is a force which acts on an object without coming physically in contact with it. </u></em><em><u>A non-contact force is a force applied on an object by another body without being in direct contact with the object. </u></em>
Some algae have chloroplasts and chlorophyll and obtain their energy through photosynthesis while some algae like euglena are both heterotrophic (decompose dead organic matter) and autotrophic (use photosynthesis) and can also obtain energy likewise.
Definite article is used before a noun (person place or thing) to indicate that the identity of the noun is known to the reader. indefinite article is used before a noun that is general or when its identity is not known.
