The answer would be survival of the fittest.
This metaphor, "<em>survival of the fittest</em>," was used by Herbert Spencer to explain <em>natural selection. </em>It is sometimes also referred to as the survival for existence. This phrase came from the Dawinian theory of evolution where he explains that all species are capable of producing many offsprings. However, the survival of those offsprings depends on their ability to adapt to the risks and opportunities of the external environment.
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</em>This relates to your scenario in the sense that fish lay a lot of eggs in the beginning but not all of them would live to achieve maturity. This is because even as eggs, they have many predators and are exposed to other elements. The threat pushes on even if they are able to hatch and grow up.
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The answer is A. They have a hydrocarbon backbone that can be chemically altered.
All of them should be correct except for the upper left box of question 8. The correct genotype of the box should be WW instead of Ww.
When making a punnett square, all the results in the 4 boxes are combinations of the alleles present in the parents. The different combinations in the square are listed according to the allele on its left and on its top. For example, in question 9, the first box of the square (left upper) should be a combination of R and R, because the allele on the left side and the top (outside the box) are R and R. And the 2nd box, which is the upper right, should be Rr, because the allele on top is r and the allele on the left is R. Always put upper case in front, so the answer is Rr.
Same concept for other boxes, just match the alleles on the top of it, and the left side of it (the ones outside the box), and rearrange the upper/lower cases, and you'll get the correct answer.
Search this on youtube : <span>Photosynthesis Equation Song - Biology Lesson
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haha this might help.
