I just looked it up, it's carbon!
Answer:
two guard cells
Explanation:
Stomata are the pores found on the surface of leaves and some stems. They are formed from two guard cells (bean-shaped cells) joined at their ends, forming a pore.
Answer:
Physical
Explanation:
The skin is a physical barrier.
Mechanical barriers are made by mucous membranes
Answer:
c , b , a
Explanation:
The sequence in which the action would pass through points c, b , a.
