Q: Veins subdivide repeatedly and branch throughout what? A:
OPTIONS:
- periosteum
- epidermis
- stroma
- mesophyll

Answer: mesophyll

Q: Dna consists of how many long chains of nucleotides? A:
OPTIONS:
- three
- zero
- one
- two

Answer: two

Q: Energy transfer between what kinds of levels is generally rather inefficient? A:
OPTIONS:
- producer
- secondary
- apex
- trophic

Answer:
trophic