Answer:
When the chemical energy in food is transferred to cells in the body, the energy can be transformed into energy used by the body to do many things like run, ride a bike, do the dishes, pump the heart, and keep the body warm.
Answer:
Archean
Explanation:
Remember that in the phyllogentic tree, there are three main groups of living things, the archea, the bacteria and the eukarya. Animals, Plants and fungi belong to the las group in which they share some charcteristics like have their DNA in a nuclear site surrounded by a nuclear membrane.
In Archea, they do not have a nucleus and they lack a membrane- bound organelles, that means, that they consider prokaryotes.
Answer:
The correct answer would be D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.
Alveoli are tiny sacs which form the site of gas exchange in the lungs.
The features of alveoli which help in gas exchange are:
- They increase the surface area in the lungs thus, more space is available for gas exchange.
- They have very thin walls, as thin as the thickness of a single cell only.
- They are surrounded by a bunch of thin capillaries which exchange gases with alveoli.
