What does mrna copy and carry the code to produce? a. dna b. proteins c. gametes d. organelles

Option B : Protein.

The genetic information is stored in DNA which is carried by mRNA (messenger RNA). This genetic information is in the form of three-base code, here each code  is used to represent an amino acid. The sequence of amino acid form proteins thus, the correct option is protein.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.