D. Artificial selection means that it doesn’t happen naturally, many dogs breeds exist because of artificial selection
Answer: Alveoli
Explanation: Alveoli is the air sacs in the lungs through which oxygen and carbon dioxide diffuse into and out of the blood.
Mixture. a compound is 2 or more elements, so it can't be an element
Answer:
Most nonrenewable resources are formed from organic carbon material which is heated and compressed over time, changing their form into crude oil or natural gas. The term nonrenewable resource also refers to minerals and metals from the earth, such as gold, silver, and iron.
Answer: Vernal equinox(about March 21): day and night of equal length, marking the start of spring. Summer solstice (June 20 or 21): longest day of the year, marking the start of summer.
vernal = spring
solstice = summer
