(Variation.)Heritable differences that exist in every population are the basis for natural selection.
(Overproduction). Competition between offsprings for resources.
(Adaptation.) a trait that helps an organism survive and reproduce.
Descent with Modification.
Answer:
1) a 2)b
Explanation:
reasons
1) Once carbon dioxide dissolves in water, it reacts with water molecules to form carbonic acid.
2) the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.
Explanation:
it depends on Which nutrients the body lacks l.however,there are some general symptoms you might experience.they include l:pallor,fatigue, depression,weakness,trouble breathing,unusual food craving,hair loss, constipation,etc
Explanation:
The correct answer here is C