Microscopic, single-celled organisms that have a complex structure similar to animals and plants are known as protoctists.
Answer:
The amount of energy at each trophic level decreases as it moves through an ecosystem. As little as 10 percent of the energy at any trophic level is transferred to the next level; the rest is lost largely through metabolic processes as heat.
There are approximately 4.7 to 5.5 liters and 1.2 to 1.5 gallons of blood in a human's body.
Photosynthesis involves the use of energy from sunlight, water and carbon dioxide to produce glucose and oxygen. Cellular respiration uses glucose and oxygen to produce carbon dioxide and water. For example, both processes synthesize and use ATP, the energy currency.