Question

round 4: no longer on the pbs website
use your brain and google to complete the following questions:
*summary: what are some structures (other than appearance) that you can look at to determine how closely related different species are? list three.
hint: you were just looking at some of them in the toolkit.
your answer
this is a required question

Explanation:

To determine how closely related different species are (excluding appearance - related structures), we can consider the following three:

1. DNA Sequences: By comparing the genetic material (DNA) of different species, we can see the degree of similarity. Species with more similar DNA sequences are likely to be more closely related as DNA holds the genetic information that is passed down through generations.
2. Anatomical Structures (Homologous Structures): Homologous structures are body parts that have a similar structure but may have different functions in different species. For example, the forelimbs of humans, bats, and whales have a similar bone structure, indicating a common ancestor.
3. Embryonic Development: The study of how embryos develop can show relationships. Many species have similar embryonic stages, and the more similar the embryonic development patterns are, the more closely related the species might be. For instance, vertebrate embryos often show similar early - stage development features.

Answer:

1. DNA Sequences
2. Homologous Anatomical Structures
3. Embryonic Development