Question

1. why are stem cells important in science today?

they only exist in animals
they contain visible chromosomes
they can become many types of cells and help treat diseases
they form only skin and blood cells

Explanation:

Stem cells are important in science today because of their unique ability to differentiate into various cell types. This property makes them valuable for potential medical applications, such as treating diseases. The option "They can become many types of cells and help treat diseases" correctly reflects this key characteristic. The other options are incorrect: stem cells also exist in plants (so "They only exist in animals" is wrong), chromosomes are not the main reason for their importance (so "They contain visible chromosomes" is incorrect), and they can form more than just skin and blood cells (so "They form only skin and blood cells" is wrong).

Answer:

They can become many types of cells and help treat diseases