Why is it difficult to attach a value to the aesthetic qualities of biodiversity

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

Place the steps tor the formation of the enzyme pepsinogen in correct order