Biology, 28.07.2019 18:30 bnnn

Hurry for 100 points and ! good answers only! 14. give a short description of star clusters. describe (1) how they are held together, (2) how old they are, and (3) how astronomers categorize them. 15. what types of stars make up open clusters, and what is the fate of these stars? 16. describe the cluster that includes our own sun. 17. how do globular clusters differ from open clusters? 18. two star clusters visible to the naked eye are and

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Hi!

14. Star clusters are held together by gravity. It really depends how old a star in the cluster is - it could be just born, or could have been born hundreds of billions of years ago. Astronomers categorize them by different colors, temperatures, sizes, brightness, etc.

15. Open clusters eventually disperse to form field stars.

16. Our sun is not part of a cluster (although it used to be).

17. Globular clusters are found in the ring of a galaxy and usually contain more stars and are much older than the open clusters.

18. Omega Centuari and M13.

Hope this helps!

Answer from: Quest

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

Answer from: Quest

Heyhonestly, probably not. humans have always had a tendency to waste things. whether it's food, cosmetic, infrastructure, or our abandoned constructions,the landscape is littered with the refuseof man. archaeology wouldn't be a developed discipline if humans didn't leave things behind. in a way it makes us human

hope it mark me as brainlieast.

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