What is it meant by variation in living things 1.Different species have different attributes
2.Different individuals within a species have variation because they may express different alleles for the same traits
3.All the possible trait variations of a single population
4.The number of organisms a given area will support

depends if youre on plato or another site

i am going to guess that it is co2.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.