Science

2. - Are nonliving particles composed of a nucleic acid (DNA or RNA) and a protein coat. Viruses need a host cell to reproduce. (Smallest)
7. - A single celled organism.
9. - Able to passed easily from one person to another.
12. - Science that explores microscopic organisms including viruses, bacteria, protozoa, parasites, and some fungi and algae.
13. - A chemical that kills both bacteria or slows their growth without harming body cells.
14. - organism that is infected with disease agent where it grows and reproduce.
15. - Animal like protists are called protozoa. Like animals, they can move, and they are heterotrophs.
16. reproduction - process of reproduction involving a single parent that results in offspring that are genetically identical to the parent.
17. - is an organism that feed on another individual, known as the host. They either live on or in their host's body.
18. - substance prepared from killed or weakened pathogens and introduced into a body to produce immunity.
19. - used to indicate a far higher number of people affected by a disease.

1. - Organisms that lack tissue differentiation are unicellular, and exhibit diverity of form and size.
3. - Agent that can induce or increase the frequency of mutation in organisms.
4. disease - May also be caused by a pathogen. They are contagious.
5. - An organism that consists of more than one cell
6. - Are non photosynthetic organisms, and most are multicellular. Many obtain energy and nutrients from dead organic matter.
8. - Are prokaryotic single celled organisms.
10. - defined as a illness. spreads rapidly to many people.
11. - Living things that cause human diseases.
18. diseases - Viral diseases are among the most widespread illnesses in humans caused by viruses.