Oxpecker birds eat ticks and other parasites that live on the skin of
rhinoceroses. This is an example of

mutualistic relationship

Explanation:

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.