Answer:
16. is b which is gymosperms
17. is d which is pistill
18. is b which is pollination
19. (I'm not sure of the answer of this question.)
20. is d which is cotyleon
Explanation:
16 is b because gymnosperms are a group of seed-producing plants that include conifers,
cycads, ginkgo and gnetophytes.
17 is d because the part of the stamen where pollen is produced is Anther. Pistill is the ovule producing part of a flower.
18 is b because pollination is the transfer of pollen to sigma.
19 (unknown answer)
20 is d because the food-storing structure in the seed is cotyleon.
