Which statement is TRUE? A) Mutations occur randomly. B) Natural selection is a
ID: 82167 • Letter: W
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Which statement is TRUE? A) Mutations occur randomly. B) Natural selection is a random process. C) Evolution is a random process. D) All of the above are true. Tiktaalik appears to: A) be a descendant of the one branch of ancestral horses that survived until today. B) be an extinct species of fish that was also able to fly due to flaps of skin between its fins. C) be a "living fossil" since it resembles many of the earliest fish, yet populations thrive today. D) be an extinct species of giant fish that was subject to strong selection for smaller body size. E) represent a transitional species, somewhere between fish and land animals What is the primary source for new, unique genes in a population? A) mutation B) natural selection C) artificial selection D) crossing over How do scientists "know" the atmospheric levels of carbon dioxide that existed on Earth hundreds or thousands of years ago? A) They deduce it from the carbon dioxide content of fossil fuels. B) They measure it from bubbles of gas trapped in Antarctic ice. C) They estimate it from the relative numbers of carbon-based life forms that existed over time. D) They measure it from erupting volcanoes, bubbling hot springs, and seeping hydrothermal vents. Which of the following is supporting evidence that whales evolved from 4-legged wolf-like mammals that lived on land? A) Whales swim by moving their spines up and down, the same way that other land mammals move. B) Vestigial leg and pelvis bones are present in some whale species C) Whales have skull structures similar to wolves D) All of the above.Explanation / Answer
Hi, as per our reguations the first full question is to be answered. I have also answerd a couple more.
6. The answer is option D. All of the above are true
The mutations occur randomly in nature. Mutations can be beneficiary or can be deleterious. If the mutation is favored in the environment then it will get fixed in the population. This drives evolution.Likewise, the natural selection occurs on the species in a random manner. Whichever species is fit enough to survive or has undergone mutations to survive in the prevailing environment get selected and others get eliminated. Hence random mutation helps to get randomly selected which drives the evolution.
7. Answer is option E.
The tiktaalik is anextinct lobe-finned fish from the late Devonian period. It has features of four legged mammal. It remembled a transition between the fishes andland dwelling four legged animals.
8. Answer is option A: Mutation
Mutations occur randomly and they give rise to changes in genes, tRNA, rRNA, and overall activity of a protein. Mutation are the primary reason why newer alleles arise and due to random natural selection they are selected and due to crossing over they are passed onto next generation.
9.The answer is option B.
The ice cores formed in antartica have been dated to be millions of years ago. These ice cores contain trapped air bubbles, which must also be as old as the ice cores. So these air bubbles can tell us about the gas content of those times and percentage of different gases in the environment.
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