URGENT A system usually consists of one or more objects A.) That can move and undergo deformations

B.) That can interact and move

C.) That can interact, move, and undergo deformations

D.) That can undergo deformations and interact

What do butterflies have on their feet which allows them to sense different strengths and types of nectar? a. mechanoreceptors b. acoustic receptors c. substratum receptors d. chemoreceptors

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?