q: Where so parasites go to survive?
Options:
- (A) in a field
- (B) away from a host
- (C) heat produced
- (D) loose soil
- (E) in the water
- (F) on a host
- (G) Most plants
- (H) retina
a: (F)... Explanation: Some parasites live on the surface of their host. Survival is to live, to live means hope. Some parasites survive on the surface of their host. That's why the answer is (F).

q: Some what will kill their host, while others won't?
Options:
- (A) barnacles
- (B) producers
- (C) scavengers
- (D) insects
- (E) cigarettes
- (F) fungi
- (G) plants
- (H) leeches
a: (H)... Explanation: Some parasites kill their host, but most do not. Leeches are external parasites. Some leeches will kill their host, but most do not. That's why the answer is (H).

q: Where do streams often get h20?
Options:
- (A) perspiration
- (B) at or near the margins
- (C) raising their temperature
- (D) the landscape
- (E) seeping out of a spring
- (F) cloudy and rainy weather
- (G) Inches or fractions of inches.
- (H) precipitation
a: (E)... Explanation: Streams may start with runoff or water seeping out of a spring. Water is everywhere H20. Streams often start with runoff or H20 seeping out of a spring. That's why the answer is (E).

q: Many _ can cause the immune system to not work properly.
Options:
- (A) fever
- (B) bacteria
- (C) radiation
- (D) fungi
- (E) A drug.
- (F) Allergies
- (G) cancers
- (H) Toxicity
a:
(G)... Explanation: Immunodeficiency occurs when the immune system is not working properly. Many cancers can cause immunodeficiency. Many cancers can cause the immune system to not work properly. That's why the answer is (G).