How do cells move potassium ions against a concentration gradient, from a lower concentration to a higher one

Acommon kind of mechanical weathering is called

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?

In cattle a single gene with two alleles determines fur color the fur can be red white or roan roan fur has both red and white hair which of the following statements is true a the allele for roan fur color is dominant over red and white fur color b the allele for red fur color is dominant over white and roan fur color c the roan and white alleles are expressed independently of the other d the red and white alleles are expressed independently of each other