What is the correct order in which these structures form during the plant reproduction process? . a. embryo sac, embryo, zygote. b. embryo sac, zygote, embryo. c. zygote, embryo sac, embryo. d. embryo, zygote, embryo sac

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.