The correct option among all the options given is A the bald eagle.
Only the non-covalent bonds like hydrogen bonds which give it's functional shape.
The guidelines for making good and accurate observations are:
1. Standardise the experimental setup: Know the precision and the accuracy of the instrument used to make observations. Example, thermometer with a least count of 1°C cannot measure in fractional values.
2.Take careful measurements: Holding the instrument properly without causing any disturbance is the key.
Producers have less energy available to them. They have to harness the light to produce energy. Their movement is restricted as a result. Tertiary consumers has the highest amount of energy at their disposal.
Coal is made up of carbon, so burning coal releases carbon
