For animals such as birds and animals that jump and fly what do their muscles act on

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.

What does it mean for a cell membrane to be selectively permable

Explain why the plants cortex would serve as the best food source for animals