The ultimate source of energy for most ecosystems is

1. The ultimate source of energy for most ecosystems is:
a. Carbon
b.Oxygen

c. Sunlight
d.Water
2. Organisms that directly use energy from the sun to make their own food are called:
3. Which of the following illustrates the correct ordering of trophic levels? 4. Within an ecosystem: 5. The efficiency of energy transfer from a lower trophic level to the next highest level is
roughly:
a. 1%
b.5%
c. 10%
d.50%
e. 80%