The answer would be 9. There are nine <span>essential amino acids needed to create a complete protein. </span>
generate energy by photosynthesis
Answer:
The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart.
Answer:
Urban soil geochemistry is strongly influenced by the effect of human activities on the environment. Building and industrial activities, motor vehicle emissions and many other factors are responsible for releasing large amounts of organic and inorganic pollutants to the environment.
Explanation:
The Ordovician is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates). A typical marine community consisted of these animals, plus red and green algae, primitive fish, cephalopods, corals, crinoids, and gastropods.