explain how genetic variation and environmental pressures can lead to a change in the characteristics of a population.

Ok, well, this is a good sum of info, so this is how I see it (just be sure to hangs it up when you write it):

Genetic variation, and Environmental factors work together to cause natural selection, for example, In genetic variation, the genes of organisms within a population change. Gene alleles determine the distinct traits that can be passed on from parents to offspring. Gene variation is important to the process of natural selection, Because the genetic variations that arise in a population happen by chance, but the process of natural selection does not. Natural selection is the result of the interactions between genetic variations in a population and the environment. The environment determines which variations are more favorable. More favorable traits are thereby passed on to the population as a whole.
But without environmental pressure either, natural selection just doesn't happen. With respect to a trait of a given population, the necessary and sufficient conditions for natural selection to occur are variability, heritability, and differential fitness by means of selective pressure, a population of organisms lives in an environment, and any selective pressure is an environmental pressure. An example of environmental pressure would be temperature, Some organisms within the population may have slight advantages over another at being able to withstand extremes, So they have increased chance of survival and reproduction, Hence, they are more likely to be "selected".

The idea is great, however, Your grammar is so horrible that I almost decided to fail this school year.

how is this Explain how genetic variation and environmental pressures can lead to a change in characteristics of a population provide an example of a plant or animal population undergoing change as an illustration. Like climate change what it does to plants are thriving in areas where their growth was limited before, thanks to temperature changes that provide more water, heat and sunlight. Climate change can be beneficial and no beneficial to plants and animals. There are situations where it’s too cold for plants to grow and situations where there is the perfect climate for plants to grow.

i still don't understand

Such a beautiful Duwang

(I bet $100 nobody got that)

This is what I put it's not the best but I got a 98% so it works...

Genetic variation and environmental pressures can lead to a change in the characteristics of a population because of species having a trait that lets them adapt to their environment. For example, a Wood Frog has adapted to cold climates by freezing in the winter. When this happens Wood Frogs stop their heart from beating and they stop themselves from breathing. They stay alive because of a special antifreeze substance that stops ice from freezing in their cells. Then the weather warms and they thaw and can start mating and eating again. They used to not be able to do this and they would die. Very little would survive and if they did it would be hard. They also have a black marking across their eyes causing an illusion of a mask. In conclusion, when genetic variation and environmental pressure work together it causes natural selection. This how the Wood Frogs have been able to live in their environment. At first, very little where surviving then as time went on they began to live longer.

does it sound good ms sue?

I think it sounds good

The environment pressures lead to a change in the characteristics of a population because it cause the animal or plant to change. For example some lizard lives on a rocky terrain where the color of the rock is gray but then they get moved to a different area where the stone is red with some Broun. After some time the color of the lizard will be the same as the rock and will thrive. Genetic variation leads to a change in the characteristics of a population because the animals that are the same species can have different traits. For example there are some birds that are the same species. One has white feathers with a bit brown and the other one has brown feathers, there are many tall trees that have white bark with brown dots the one with white and brown feather will thrive and make more birds that are the same in color the other one will be eaten because the colors are easy to be seen.

Can someone simplify all of these wonderful answers please that would be great all of you are beautiful people helping each other out here.Have a beautiful day!God said love one another as I have loved you and you are all doing that towards each other well some more than other's Bye bye now.