Answer:
Carbondioxode is present in the atmosphere which is used by plants during the process of photosynthesis. From this process, plants make their food by using carbondioxode from the air for making glucose. The carbondioxide is released in the atmosphere by the animals during respiration process and the carbon concentration is stable.
Increase occurs in carbondioxide concentration due to human activities such as use of fuels in vehicles and industries.
Answer: Primary succession is succession that begins in an area w/no remnants of an older community.
Explanation:
The answer is a process that selects variation that help survival and that spreads the variation to more offsprings.
The idea is that there is a higher chance of survival if the organisms has certain characteristics and it is more likely to pass on their genes of this characteristic to the next generations.
For example, there's dark colored fish and white fish. In the deep ocean, dark colored fish can camouflage themselves. However, white fish can be seen easily by predators. Therefore, eventually more dark colored fish survives and more offsprings are dark ones.
Answer:
A, cholesterol in the blood
Answer: The endocrine system is made up of glands that make hormones, Hormones are the body's chemical messengers. They carry information and instructions from one set of cells to the other.
Explanation:
