HELP ME PLEASE HELP ME PLEASE I DONT UNDERSTAND Why are models, such as a model of DNA, important to use in studying science?

A None of these

B Models help scientists understand concepts and processes

C Both of these

D Things may be too big or too small to measure or use practically

option  B

Explanation:

Because scientist wants to how a child is similar some what to its parent .HOW it get same feathers as its parent?

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.