Answer:
They are called Stomatas.
Explanation:
A waxy cuticle covers all aerial surfaces of land plants to minimize water loss. These leaf layers are clearly visible in the scanning electron micrograph. The numerous small bumps in the palisade parenchyma cells are chloroplasts.
You can find this information here: https://courses.lumenlearning.com/wmopen-biology2/chapter/plant-structures/#:~:text=Stomata%20on%20the%20leaf%20underside,palisade%20parenchyma%20cells%20are%20chloroplasts.
Lack of antibodies because thats the stuff to fight things away
Bowling ball,as there is more mass and the force of gravity
Increases plant growth, more transpiration
Answer: blood travels from the heart through arteries and blood travels to the heart through the veins.
I hope this helps