Water molecules are polar. This means that one end of the molecule is positively charged, while the other is negatively charged. Opposite charges attract. Water molecules on the faucet that are eventually pulled away from the others by gravity will themselves pull together and form round drops because the charged portions of molecule attract the oppositely charged portions of another.
Explanation:
Meiosis is beneficial as it produces gametes that are genetically different to the parent cell, and when the gametes combine the offspring produced is made from combination of genes from both mother and father. The offspring is genetically unique, there is no other organism on the Earth with the exact same DNA sequences on their chromosomes.
Answer:
Zebra mussels negatively impact ecosystems in many ways. They filter out algae that native species need for food and they attach to--and incapacitate--native mussels. Power plants must also spend millions of dollars removing zebra mussels from clogged water intakes.
1. A human eats a deer. Which of these terms applies to the relationship between the human and the deer?<span>
Answer: predation
2.</span>Humans and sharks both eat fish. Which of these terms applies to the relationship between the human and the shark?
Answer: Competition
3.Humans who have pets tend to be healthier than humans who do not have pets. Which of these terms applies to the relationship between a human and a pet?
Answer: mutualism
4.What is implied by the reference, "biotic portion of an ecosystem"?
Answer: the "living" portion of the ecosystem
5.What term applies to the relationship between a dog and a blood-sucking tick?Answer: parasitism
6.An egret eats insects stirred up by grazing animals. Which of these terms applies to the relationship between the egret and the grazing animal?Answer: commensalism
7. The concept that two species cannot occupy the same ecological niche simultaneously and continuously is called:Answer: the competitive exclusion principle
8. What is a serious problem that will result from predicted rises in global temperature?Answer: Species will be lost because rises in global temperature will exceed the rate at which natural selection can allow most organisms to adapt.
9. Why do most mutations occur?Answer: Random errors in DNA replication cause mutation.
10. What is the best definition of speciation?Answer: the process by which new species form
11. What is speciation resulting from two populations becoming isolated from one another?Answer: allopatric speciation
12.A scientific name is composed of two parts. What are they?Answers: genus and species
13. What is the smallest group that can evolve?Answer: population
14. A forest fire kills off 90% of a rabbit population. What has occurred in this population?Answer: bottleneck
15. How do founder effect, genetic drift, and a bottleneck relate to each other?Answer: Founder effect and bottleneck are types of genetic drift.
16. In the common phrase, "survival of the fittest," what determines how fit an individual is?Answer: reproductive success
17. Which postulate of natural selection is best supported by the work of Gregor Mendel?Answer: Traits are passed from parent to offspring.
18. What can you conclude by looking at the following sequences from the cytochrome c gene of humans, mice, and an unknown organism? Human - ATGGTCTCTTT Mouse - ACGGTCTGTTC Unknown - ACGGTGTGTTCAnswer: The unknown organism is more closely related to mice than to humans.
19. What conclusion can you make from comparing the bones in a bird wing, a bat wing, and a pterodactyl wing?Answer: These organisms share a common ancestor with each other.
20. When predatory snakes eat songbirds with the loudest songs, they are acting as agents of what?Answer: natural selection
Answer:
The correct answer is A. stabilizing selection
Explanation:
Stabilizing selection is one type of natural selection that occurs when the population having non-extreme traits are stabilized. It results in overexpression of a particular trait in a population. Here most average individual gets selected.
So as the stabilizing selection favors the middle phenotype and not extreme phenotypes it decrease the genetic variation. So here individuals who are having extremely long snout are selected therefore a particular trait is selected and overexpressed in the population. So it is an example of stabilizing selection.
