27-Elastic fibers of connective tissue: a-Are composed mainly of tropocollagen.
b-Are abundant in the ligaments of vertebral column.
c-Are thinner than collagenous fibers.
d-All of the above are true.
e-Only b + c are true.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

not sure if this is what you'r looking for eubacteria and archaebacteria

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).