Which definition is the best for “semipermeable membrane”? it is a barrier that prevents materials from moving from one side to the other. it is a barrier that allows materials to move freely from one side to the other. it is a barrier with tiny openings that let some, but not all, materials pass through. it is a barrier that materials move from one side to the other.

Option C, It is a barrier with tiny openings that let some, but not all, materials pass through

Explanation:

A semipermeable membrane is a biological membrane that allows some substances to pass through it. Such type of membranes are also referred as selectively permeable membrane as they do not allow all substances to pass through it non-distinctively.

For example the cell membrane , wall of arteries, wall of intestine etc.  are semipermeable membrane.

Hence, option C is correct.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.