Question

23. How does natural selection cause evolution?
24. How do bacteria become antibiotic resistant?
25. Human birth weight is a classic example of:
26. Imagine that those who had children at a younger than average age tended to leave more
descendants than others. This continued to be true over hundreds of generations across the
planet. What else would evolve as a consequence?
27. Which is definitely an INCORRECT explanation for why we grow old?
28. Why is adaptation imperfect?
29. Anatomical similarities, like the number and structure of bones, among vertebrate
forelimbs suggests that all vertebrates evolved from a common ancestor.
30. Which are true of cancer cells?

Answer 1

23. How does natural selection cause evolution?

Natural selection is when nature selects a trait over another.

A population has variations and the organism which is better survives. The organism who survives reproduces and eventually a new population is formed which consists of the more fit organism.

Ex- A population of bacteria can survive at 60 degrees. But due to mutation, a bacteria develops which can survive at 65 degrees. Then when the plate consisting of these bacteria is kept at 65 degrees all the bacteria die and only the one which is at 65 degrees survives. Eventually, the one 65 degrees reproduce and finally the entire population now consists of the bacteria which survive at 65 degrees. This is called natural selection.