Identify the parts of a leaf that make up it's transport system

Blade
Thin, flattened section of a plant leaf that collects sunlight

Petiole
Thin stalk by which a leaf blade is attached to a stem

Mesophyll
Specialized ground tissue that makes up the bulk of most leaves; performs most of a plant's photosynthesis

Palisade Mesophyll
Layer of tall, column-shaped mesophyll cells just under the upper epidermis of a leaf

Spongy Mesophyll
Loose tissue beneath the palisade layer of a leaf

Stoma
Opening in the underside of a leaf that allows carbon dioxide and oxygen to diffuse into and out of the leaf

Guard Cell
Specialized cell in the epidermis of plants that controls the opening and closing of stomata by responding to changes in water pressure

Transpiration
Loss of water from a plant through its leaves

(Got this from my textbook so here)

The answer is c) tons