D. 1,200
This is because if it takes 1 and a half hours **1.5** to travel through city a and city b , and the plane goes 800km per hour and 400km is half of that it then the answer has to be d.
Each organism has a job in a community
D. cellular respiration and photosynthesis
Recycling can conserve natural resources. Recycling is an important factor in conserving natural resources and greatly contributes towards improving the environment. Recycling conserves natural resources, such as wood, water, minerals, and fossil fuels, because materials can be reused.
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