To move molecules across the membrane against a gradient
Answer:
Sexual reproduction is from the stems, and asexual reproduction is from the seeds Explanation:
They determine it because of the hypothesis. It changes during the investigation and the independent variable stays the same through the whole experiment.
Its either a or c but I'm going towards a
Answer:D. c, a, b, d
Explanation:humans can synthesis vitamin D as cholecalciferol in the skin when the skin is exposed to ultraviolet-B from the sun.this cholecalciferol is modified to calcidiol in the liver.this calcidiol is then modified to calcitrol in the kidney.parathyroid hormone activates the vit D