Fredrika's science teacher asked her to bring in three biotic items from her backyard ecosystem. which of the following groups of items should she bring? a. a ladybug, a spider, and some water from a mud puddle b. a lightning bug, a plug of grass, and a worm c. a caterpillar, a pine cone, and a piece of a robin's egg d. a smooth rock, some red dirt, and an empty bird's nest

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s. when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?