A membrane that only lets certain molecules in while keeping other molecules out is
1:flexible
2:bilipid layers
3:slectively permeable

Why do bacteria thrive even in hostile environments

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?