The catalytic converter most likely was developed in response to * A) the demand for more energy-efficient cars
B) the demand for increased car engine power
C) a need for lower-priced cars
D) a need to reduce air pollution

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.