Answer:
such as tissue paper, do not allow light to pass through as easily, and images cannot be seen clearly. Opaque materials, such as wood and metals, allow no light to pass through.
Explanation:
Answer:
Stimulation of thoracic or lumbar spinal regions; impulse reaches chain ganglion; acetylcholine release
Explanation:
The ecological footprint is defined as the biologically productive area needed to provide all the resources that a human population needs to survive. It is a measure that calculates the human demand on nature and can be used as an indicator of the human impact and dependency on Earth's ecosystem. The ecologists use the ecological footprint concept to estimate the earth's carrying capacity for humans.