Question

4)

Answer 1

Comparison of items eaten for food is the least useful technique to help scientists to determine whether two different animal species have evolved from a recent common ancestor

Explanation:

A recent common ancestor (RCA) is the species referred in Genealogy which refers to the very recent individual organism from which a set of organisms is descended. It defines the gene ancestry of an organism.

An evolutionary tree depicts the factors which can be used to relate two species based on evolution through evolutionary relatedness like feeding ecology and distribution of the organisms geographically.

Comparison of items eaten for food and feeding ecology of animals helps to identify RCA.

Mapping the lineage of dietary shifts or changes in foods eaten by among organisms (meat-eating or herbivores) adapted due to environmental adaptations by studying and comparing eating habits or behaviors can help to trace the RCA .

Answer 2

Scientists routinely explore whether two different animal species have evolved from a recent common ancestor.Comparisons of items eaten for food is the LEAST useful technique to help with this determination

Explanation:

The features that are related to the anatomy of two organisms when they share them in common indicates that they are evolved from the common ancestor. When there exists a common feature between any two species physically then it is inherited form the common ancestor.

The two species having common traits involves similar genetic material called DNA, genetic codes that are similar and same translation and transcription process. Thus studying about genes and gene expression will be helpful to explore whether  two different animal species have evolved from a recent common ancestor than including the studies related to Comparisons of items eaten for food.