What is a vestigial stucture A. A type of soul without a membrane-bound nuclear us and without a membrane bound organelles
B. Structures that occur in different species better similar enough to suggest that that the Species had a common ancestor
C. A type of sale that has a membrane-bound nuclear us in a membrane-bound organelles
D. Structures that appear to have no function for the organism but probably had a function in an ancestral organism

Explanation:

Vestigiality is the retention during the process of evolution of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homologous features in related species.

300

Explanation:

We want to estimate the population of 1000m2 but in our sample of 100m2 we found 30 organism and we know that there are ten 100m2 in 1000m2 meaning there is an estimate population of 300 resulting from 30 per 100m2 sample X 10 [which is the total number of 100m2 in 1000m2].