<span>They are not visible because the chromatin coils up,shortens,and thickens.</span>
<span>A solution is hypertonic to a cell if it has a higher solute (dissolved substance) concentration than the cell does. As a result, it also has a lower concentration of water than the cell does. Cell membranes and plant cell walls are semipermeable barriers, which means that certain molecules can diffuse through them, while other molecules can not.</span>
Answer:
Lymph nodes become swollen in response to illness, infection, or stress.
Explanation:
Swollen lymph nodes are one sign that your lymphatic system is working to rid your body of the responsible agents.
<span>contractile vacuole
Contractile vacuoles are organelles that are responsible for excretion function. They perform osmoregulation which manages wastes, water and other needed materials in the cell. They are found in some prokaryoric organisms like the algae, protists, amoeba and other unicellular organisms.
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Plant cells have a cell wall and cell membrane... Animal cells have a cell membrane but no cell wall
