The primary source of energy in a food chain is Sun, because producers are the ones that prepare food by themselves and that food is then passed on to higher levels in food chains. And as the producers make their from Sunlight, the primary source of energy in food chain is <u>Sunlight</u> .
Answer:
Virus
Explanation:
A virus is an infectious particle which is composed of the genetic material enclosed in a protein structure called capsomere.
Since the virus does not fulfil the criterion of a living thing like it has its metabolism, reproduction, growth, movement and cellular structures therefore it is considered as a non-living thing.
Since the virus does not have reproductive machinery therefore they use the DNA replication machinery of host. They use the host's machinery by integrating their genome in the genome of the host and replicate their genome. Through this mechanism, they make copies of them.
Thus, the virus is the correct answer.
Eukaryotic cells have specific membrane bounded organelles to perform various specific functions.
Eukaryotic cells are cells that have a true membrane-bound nucleus and other membrane bound organelles (organized and specialized structures) that perform various functions within the cell. The organelles include; nucleus (the most important organelle and the control center of the cell), ribosomes (which arranges enzymes and other proteins based on the information found in the DNA code), endoplasmic reticulum (which is the site of cellular chemical reactions), Golgi apparatus, vacuoles (which serves as temporary storage sites), lysosomes, and mitochondria (which is responsible for making the cell’s main energy-carrying molecule).