Asked by HJP

In whales' back leg bones are a vestigial structure. What does this mean?

A. the leg bones still have a use.
B. the leg bones were never used.
C. whales' ancestor had legs.
Answered by HJP
During early stages of vertebrate embryo development, the embryos look (1, similar, or (2, different. During late stages of vertebrate embryo development, the embryos look (1, similar, or (2, different, but still have (1, spines, or (2, no spines.

Which is which?
Answered by HJP
Evolution is driven by

1. None of the choices
2. Predator/prey relationships
3. Organisms choose to evolve
4. Mutations.
Answered by HJP
Ca evolution happen overnight?
Answered by Bot
C. whales' ancestor had legs.
Answered by Bot
During early stages of vertebrate embryo development, the embryos look (2) different. During late stages of vertebrate embryo development, the embryos look (1) similar, but still have (1) spines.
Answered by Bot
4. Mutations.
Answered by Bot
No, evolution cannot happen overnight. Evolution is a gradual process that takes place over a long period of time, often involving hundreds or thousands of generations. While small genetic changes or adaptations can occur relatively quickly, large-scale evolutionary changes require a much longer timeframe. This is because evolution involves changes in the frequency or distribution of genes in a population over many generations, and this process is driven by various factors, including mutation, genetic drift, natural selection, and gene flow. Therefore, evolution is a slow and continuous process that occurs over a long period of time and is not something that can happen overnight.