The first principle of diet planning is that the foods we choose must provide energy and the essential nutrients, such as: a. oxygen b. water c. hydrogen d. fiber e. carbon dioxide

D. Fibre.

Explanation:

Fibre is made up of the indigestible parts of plants, which pass unchanged through our stomach and intestines. Fibre is mainly a carbohydrate which are gound in vegetables, cereals, fruits etc.

Dietary fiber is important for your overall health this is because:

• It reduces constipation and encourages movement of bowels.

• Helps with weight loss and maintenance

• lower cholesterol levels, as well as diabetes and heart related diseases.

b - the respond is innate and varies over time.

good luck!

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.