Question

2ow does the excretion occur in unicellular organism?
3) What are meninges?​

Answer 1

Answer:

Many unicellular organisms such as Amoeba excrete their waste products by diffusion from their body surface as they are small in size. Multicellular organisms such as Hydra carry out water excretion by creating a break in its body wall which is a result of strong contraction when its gut is distended with fluid.

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Answer 2

2)ans:

Unicellular organisms like ameoba excrete through the process of diffusion. Diffusion occurs when the particle spread. They move from higher concentration. Unicellular organisms usually remove waste through osmosis.

3)ans: Three layers of membranes know as meninges protect the brain and spinal cord. The delicate inner layer is the pia meter. The middle layer is the arachnoid, a web-like structure filled with fluid that cushions the brain. The tough outer layer is called the dura mater.