Why does white water rafting damage river and streams? A)
The raft decreases the current within the system.
B)
The presence of humans decrease the available oxygen in the ecosystem.
C)
Riverbeds are dredged to eliminate hazards.
D)
The presence of humans scare off aquatic life.
E)
Photosynthetic rate is decreased.

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.