Which factor will best help a scientist produce valid experimental results?

Using large sample sizes and multiple replications of experiment

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;