Biology, 04.10.2019 21:00 kaileyy06

What is control, constants, independent and dependent variable, experimental and control group?

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1)Control Group - Group that does not receives the treatment.
2)Experimental Group - Group that receives the treatment.
3)Constant - The variable you keep the same.
4)Independent Variable - The variable you control.
5)Dependent Variable - It depends on the independent variable.

Example:
You want to know how much taller plants will grow with fertilizer. You do an experiment. Flower A receives fertilizer but flower B does not. Both flowers receive the same amount of water and sunlight. The control group would be flower B, the constants would sunlight and water, the independent variable would be the fertilizer., the dependent variable would be the plant's height, and the experimental group would be flower A.

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

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.
Which phrases accurately describe an ellipictal galaxy

Which phrases accurately describe an ellipictal galaxy

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