Answer is B. Best way to check is make a square
<span>Lactase enzymes oftentimes come into contact with body temperature entities - 37 C. Ultimately, the enzyme's activity gradually increases with temperature up until about body temperature. Optimum pH for this enzyme is 6. These values provide efficient life of the lactase enzyme.</span>
I honestly think that a or d would be the best options. I would start with D and if that doesn't work try a.
Right answer is c.
DNA is in the form of antiparallel strands twisted as a double helix.
nearly perpendicular or closer to a 90˚ angle
