The answer is B because:
Cell walls are made of cellulose and proteins (hence II).
Animal cells don't have cell walls (only cell membrane) but plant cells do so IV
They must be semipermeable since materials for example carbon dioxide and water for photosynthesis have to go into the cell <em>some</em> way.
A stale, moist smell
a moth is similar to a butterfly but mostly flies at night and is less colorful and plant-eating caterpillars
I hope what they said helps!
Answer:
pulse
axon
action potential
frontal lobe
hypothalamus
occipital
dopamine
Before receiving a nerve impulse, a neuron is at its resting potential, with more negative charges inside the cell than on the outside of the cell. When the neuron receives the nerve impulse, it is depolarized, allowing positive ions to flow across the cell membrane into the neuron. This is called an action potential, and the action potential travels the length of the neuron, taking advantage of the myelin sheath on many neurons. Once the signal has traveled through the neuron, the sodium-potassium pump repolarizes the cell, restoring the resting potential of the neuron.
Explanation:
FALSE
because they replicate or reproduce only in living cells where they cause a number of diseases.
