Answer: A
Explanation:
A agrees with the original statement, so if Fred cannot swim it must be absolutely true that he is not one of Kay's brothers. Dave being able to swim would support that he is one of Kay's brothers, not refute it. Walt being able to swim does not automatically mean he is related to Kay, so that is not necessarily true. Pete being unable to swim also refutes the original statement. Mark not being Kay's brother has no correlation to his swimming ability.
b. In this stage, the sister chromatids pull apart and migrate toward opposite ends of the cell.
c. In this stage, the pairs of sister chromatids attach to the spindle fiber.
d. In this stage, the membrane breaks down, freeing the chromosomes.
Endothermic reaction
Exothermic reaction
Endothermic reaction
An endothermic reaction is those reactions that take up energy from the environment as that proceeds. The opposite is an exothermic reaction that gives off energy to the environment.
Explanation:
When cooking an egg you require energy to break down the interactions between the protein chains and atoms of the raw egg so they are rearranged into a cooked egg. This is akin to the denaturing of proteins. Cooking food helps ease their digestion. Because we need energy to break down the interactions and bonds of the proteins in the egg this is why we use fire in cooking. This is, therefore, an endothermic reaction.
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Disruptive selection is taking place in the snail population based on their shell color. Snails with light colored shells blend in with sand while snails with dark colored shells blend in with rocks. This leads to a split in the population with extreme phenotypes being favored.
The type of natural selection taking place in this snail population is disruptive selection. Disruptive selection occurs when extreme phenotypes are favored over intermediate phenotypes, leading to a split in the population. In this case, snails with light colored shells are favored in the sandy habitat, while snails with dark colored shells are favored in the rocky habitat. This results in a bimodal distribution of shell color.
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Answer;
-Disruptive selection
Disruptive selection results in the creation of two distinct phenotypes.
Explanation;
-Disruptive selection is a type of natural selection that selects against the average individual in a population. The make up of this type of population would show phenotypes of both extremes but have very few individuals in the middle.
-The variance of the trait increases and the population is divided into two distinct groups. The disruptive selection will cause organisms with intermediate traits to reproduce less, and will allow those organisms with extreme traits to reproduce more.
B. A fish swimming upstream
C . A bird building in a tree
Answer:
cow eating grass
Explanation: