As energy moves through trophic levels in an ecosystem the amount that is available decreases. ... A: Energy flows in a food web by being transferred to and between organisms as they undergo photosynthesis, are consumed by another organism, or decompose.
Answer:
Individual organisms don't evolve. Populations evolve.
Explanation:
Because individuals in a population vary, some in the population are better able to survive and reproduce given a particular set of environmental conditions
Answer:
To increase the absorption of nutrients into the bloodstream.
Explanation:
The small intestine is the largest organ of the digestive system. It is meant for the absorption of food. The majority of food is absorbed by the small intestine.
For this purpose, the small intestine is long and has villi. These villi increase the surface area of the small intestine which enhances the absorption of nutrients. It directly absorbs into the blood.
The small intestine is also divisible into 3 parts - duodenum, jejunum, and ileum. Most of the absorption happens in jejunum and ileum. In the duodenum, bile mixes with food and break it down.
This is the very reason the small intestine is the longest organ.
