humans mice and giraffes share common ancestor what traits help scientists understand that these organisms share a common ancestor?
A. They all are very different in size
B. they all have seven vertebraes in their neck
C. they once had wings
D. they're all by pedal
B. they all have seven vertebrae in their neck (this is a unique and specific trait that indicates a shared ancestry)
A common ancestor is an organism that is the ____ ancestor of two or more different organisms.
A. direct
B. indirect
C favorite
A. direct
Natural selection is:
A. the idea that trades that help animals survive and reproduce become more frequent
B. embryo sharing features in the late stages of development
C.that all vertebrates have seven vertebrates in their neck
A. the idea that traits that help animals survive and reproduce become more frequent
To understand if humans, mice, and giraffes share a common ancestor, scientists look for certain traits or characteristics that are shared among these organisms. The correct answer would be B. They all have seven vertebrae in their neck.
Explanation:
When organisms share common ancestry, they often have similarities in their anatomical structures. In the case of humans, mice, and giraffes, one common feature that scientists have observed is that they all have seven vertebrae in their necks. This trait indicates a shared development pathway from a common ancestor.
Option A is incorrect because being different in size does not necessarily indicate a shared ancestry. Organisms can vary significantly in size even if they share a common ancestor.
Option C is also incorrect because none of these organisms currently have wings. However, the presence or absence of wings in their ancestors could be useful in determining their evolutionary relationships.
Option D, "they're all bipedal," is incorrect as well. Humans are the only bipedal organisms among the three mentioned. Mice and giraffes are quadrupedal, meaning they walk on all four limbs.
Therefore, the most accurate trait that helps scientists understand the shared ancestry between humans, mice, and giraffes is that they all have seven vertebrae in their necks.