Gel electrophoresis separates fragments on the basis of weight and electric charge. Heavier and/or positively charged fragments don't go as far as lighter and/or negatively charged ones.
Are there suppose to be choices?
Homeostasis it is an organism's ability to keep a constant internal environment.
Answer:
a. When a fetus is 13-15 weeks old
Explanation: is correct
~ B - Adding wood to a burning fire to increase the heat.
A is kind of like a reaction to negative feedback - it's too hot, so cooling down.
C is like turning the air conditioner off. It's cool enough.
B on the other hand adds something to the whole by reinforcing it. The fire is a metaphor for the writer's self-esteem, ego, good-feelingness, what-have-you.
