Don't pollute the Earth.
Don't need gas.
I believe the term for an observable trait of an organism would be called or noted as the organism's phenotype.
Females are more likely to be carriers of X-linked traits, and males are more likely to express them.
1) all of the above
2) rocketry
3) 1
4) not sure about this one because magnitude of one was the brightest then 2, then 3. 6 was the least brightest and 6+ or -1 or 0 or you could say, below 1 did not exist at that time..
