Plz help ive been stuck on this for 30 mins

Which are forms of nitrogen that are usable by humans

Name the type of chemical that speeds up digestion

Plz ! having a smooth seeds is the dominant trait. having wrinkled seeds is a recessive trait. the offspring of two plants with smooth seeds, a. must have smooth seeds. b. may have smooth or wrinkled seeds. c. must have wrinkled seeds. d. have a 25% change of having smooth seeds.