HELP PLEASE ITS MULTIPLE CHOICE Why is the total mass of the atoms before and after a reaction the same?

A) because The equation is unbalanced

B) Because your reaction can happen in both directions

C) some of the Atoms have become different kind of atoms.

D) all the atoms are still there, just connected in different ways

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .

What is the compliment dna strand to the following sequence: ttgactaggcta

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated