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what is structure x?
a
a cell, a level of organization that is lower than a tissue

b
an atom, the second level of organization in a living organism

c
a tissue, the highest level of organization in a living organism

d
an organ, a level of organization that is higher than an organelle

(sorry if im incorrect)

D

an organ, a level of organization that is higher than an organelle

Explanation:

So levels of structures goes :

atom, molecule, organelle, cell, tissue, organ, organ system, organism

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

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.