Answer:
objective lenses
Explanation:
objective lenses with different magnifications, screwed into a circular "nosepiece" which may be rotated to select the required lens.
Water can pass throught the cell membrane because, the cell membrane has little holes in the membrane allowing water to go through
Around 40% of living ferns are tropical epiphytes (plants that live on the surface of another plant), a reality that backings the theory that the starting point and inevitable control of angiosperms in tropical woodlands both uprooted and made new open doors for other plant ancestries.