What does it mean for a membrane to be selectively permeable?
Only certain molecules are allowed to pass through.
The membrane is rigid and only allows water to pass through.
All types of molecules are able to pass into the cell.
The membrane is rigid and nothing can enter or leave the cell.

Could someone me with number one you

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?