1. f
2. f
3. t
4. f
5. t
6. f
7. t
hope this helps
1. false
2. fasle
3. true
4. false
5. true
6. false
7. true
good luck :)
Answer:
A Chemical, gas produced
Explanation:
Osteoblasts
Cells that secrete protein fibres in bones are called osteoblasts.
I hope this helps.
im not doing that sorry,
