Which biome does this photograph represents

This looks like a Desert Biome to me. You can see a scarcity of plants. Spiky, cactus-like plants are also visible. You can also see the colour of the dirt. There is also no visible water source.

option a is correct i.e.

only sodium ions can pass through the membrane.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

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