19. B - mitochondria
20. D - vegetative structure
21. C - inducing a mutation
22. A - phosphates
23. C - fungi
24. A - provides support
25. C - sponges
26. B - opposite charges
27. D - asexual reproduction
28. not sure about this one sorry
29. D - all of the above
30. A - prevents ions and large molecules from passing through the membrane
2019 years have humans been on earth
D) orbit the nucleus like the planets orbit the sun.
this idea was first proposed in the rutherford model:)
Answer:
A blood donor is a person who donates blood and a blood recipient is a person who receives donated blood.
Explanation: