Which of these is not an example of intracellular communication?

a. charged ions distributed across a plasma membrane
b. water regulation by a cell's central vacuole
c. a signal is translated to cause a muscle to contract
d. chemical messengers dock onto receptors of adrenal glad

use smarts app it gives all theanswers

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.