observe the following figure and answer the following quwstion
Answers
Answer:
nhi pat h
Explanation:
plzz follow me
Answer:
Vestigial Structures
Structures like the human tail bone are called vestigial structures. Evolution has reduced their size because the structures are no longer used. The human appendix is another example of a vestigial structure. It is a tiny remnant of a once-larger organ. In a distant ancestor, it was needed to digest food, but it serves no purpose in the human body today. Why do you think structures that are no longer used shrink in size? Why might a full-sized, unused structure reduce an organism’s fitness?
Comparing DNA
Darwin could compare only the anatomy and embryos of living things. Today, scientists can compare their DNA. Similar DNA sequences are the strongest evidence for evolution from a common ancestor. Look at the diagram in Figure 9.3.5 . The diagram is a cladogram, a branching diagram showing related organisms. Each branch represents the emergence of new traits that separate one group of organisms from the rest. The cladogram in the figure shows how humans and apes are related based on their DNA sequences.
Evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation. ... Image credit: "Darwin's tree of life, 1859," by Charles Darwin (public domain). ... To give one classic example, the forelimbs of whales, humans, birds, and dogs ... Some homologous structures can be seen only in embryos.
Anatomy. Species may share similar physical features because the feature was present in a common ancestor (homologous structures).
Molecular biology. DNA and the genetic code reflect the shared ancestry of life. ...
Biogeography. ...
Fossils. ...
Direct observation.