What were the three major observations that charles darwin contributed to evolution?

The 3 major observations were:

1. More individuals are produced each generation that can survive.

2. Phenotypic variation exists among individuals and the variation is heritable (through parents' genes).

3. Those individuals with heritable traits better suited to the environment will survive.

Explanation:

Charles Darwin was a British naturalist who proposed the theory of known to everyone as  'The Theory of Evolution' through natural selection.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

the answer is c. altitude. hope this ! #brainiac