question... Where is ecosystem complexitiy generally least?
Options:
- (A) humans disturb it
- (B) frontal zones
- (C) in lakes
- (D) at the ocean
- (E) our planet
- (F) at the poles
- (G) mouth of rivers
- (H) at the equator
answer... Biodiversity generally increases from the poles to the equator. Biodiversity contributes to ecosystem complexity. Ecosystem complexity generally increases from the poles to the equator.
The answer is (F)

question... How can viruses make copies of themselves?
Options:
- (A) A compound that donates proton
- (B) attach themselves to cells
- (C) have sex with another virus
- (D) distances themselves from cell
- (E) attach themselves to viruses
- (F) it needs them
- (G) rapid expansion
- (H) By wind and rain
answer... Viruses cannot reproduce by themselves. Viruses attach themselves to cells and reproduce. Viruses cannot make copies of themselves alone. They need to attach themselves to cells.
The answer is (B)

question... The loss in length of what causes cells to age?
Options:
- (A) fur and fat
- (B) layers of fat
- (C) cell membrane
- (D) sunlight
- (E) Chlorophyll
- (F) telomeres
- (G) programmed cell death
- (H) cancer
answer...
Aging occurs as cells lose their ability to divide. Portions of the telomeres are lost each time a cell divides. Aging occurs as cells lose their telomeres.
The answer is (F)