When we say 'survival of the fittest', does it mean that:
(a) those whose are fit only survive or 
(b) those that survive are called fit? Comment.

2

(a)

'Migration may enhance or blur the effects of selection. Comment.

2

(a)

Why is nascent oxygen supposed to be toxic to aerobic forms?

2

(a)

What are we referring to when we say 'simple organisms' or 'complex organisms'?

2

(a)

Rearrange the following in increasing order of evolution:Gnetales;Ferns;Zosterophyllum;Ginkgo.

2

(a)