14. Dermis
15. Chemical
17. Virus
18. Antibodies
19. Gas exchange
20. Ligament
Hope this helps!
Bacteria are involved in oxygen and food production, environment recycling and cleanup, and in health maintenance and medicine production.
It does not belong to a food group if it contains sugar it then for just has calories
Answer:
Asteroids are rocky and metallic objects that orbit the Sun but are too small to be considered planets.