How is it possible for us to have a genetic disease that your grandparents had/have but our parents never had it?

because they where still somehow related to you

Explanation:

autosomal recessive disorder,

Explanation:

you inherit two mutated genes, one from each parent. These disorders are usually passed on by two carriers. Their health is rarely affected, but they have one mutated gene (recessive gene) and one normal gene (dominant gene) for the condition. recessive single-gene diseases often show a clear pattern in which the disease "skips" one or more generations. Phenylketonuria (PKU) is a prominent example of a single-gene disease with an autosomal recessive inheritance pattern.

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.

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /