I believe that the answer should be D. Cell cycle.
The sign of lead poisoning in children would be impaired development.
Lead is very toxic to the brain, so lead poisoning will be especially dangerous in children when the brain is developing at a high rate. Damage to the brain will cause the children to have an impaired development and growth, gastrointestinal pain, or neurological issue like seizure.
Answer:
The diagram is depicting that light energy from the sun, carbon dioxide from air and water from soil are required for producing sugars and oxygen by the plant. The sugars produced by the process of photosynthesis is glucose. Oxygen is produced as by-product of this reaction. The glucose produced by the plant cells is utilized to carry out essential functions whereas the oxygen is mostly released into the air and it is also used for cellular respiration.
