The cell membrane consists of a lipid bilayer with embedded proteins. What is one reason that proteins are essential for the cell membrane to function properly?

What is the measure of ∠m? 81° 65° 53° 98° answer plz

All of the following are free tools to you prepare for the sat except

In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.