All cells are surrounded by a membrane.

which sentence states a characteristic of a cell membrane?

1) it is rigid.

2) it is semipermeable.

3) it is weak.

4) it is square.

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.

Which food could be transported in a galvanized metal container?

What is the identity of the planets?