The correct answer is option C, that is, viruses.
An infection occurs when a foreign species moves inside the body of an individual and causes harm. The species utilizes the body of that person to reproduce, sustain itself, and colonize. These infectious species are called pathogens. The examples of pathogens are viruses, bacteria, prions, and fungi.
Of the given options, viruses are the smallest infectious agent. The viruses are basic particles, which must infect a host cell to reproduce and develop. Viruses utilize the host cells metabolic machinery to double themselves.
Answer:
the body can make all of the compounds it needs
Explanation:
the body gets energy from some compounds
I think the hydra lacks the specialized cells for touch and chemical detection. On the other hand earthworms have touch, light, vibration and chemical receptors along the entire body surface. Both of them are invertebrates (those animals without a backbone), they include insects, worms, jelly fish, spiders among other animals.
<span>The
cells in this experiment were macrophages. These immune system cells
have many lysosomes for the destruction of bacteria and other invaders
brought into the cell via phagocytosis. The enzymes (hydrolases) that
carry out this catabolic activity are synthesized in the endoplasmic
reticulum, modified in the Golgi, and transported to the lysosomes.</span>
