Answer:
Explanation:
Carbon dioxide from the atmosphere dissolves in the surface waters of the ocean. ... Photosynthesis by tiny marine plants (phytoplankton) in the sunlit surface waters turns the carbon into organic matter. Many organisms use carbon to make calcium carbonate, a building material of shells and skeletons
Answer - Purpose of the cell cycle is generally replicate and split itself thru mitosis and its stages to make more cells.
Reason - Cell cycle is generally important to all organisms because it helps develop and keep things going. Such as a T-Cell which is white blood cell that help protect us from virus/bacteria. Or Brain cells which helps neurons with chemical nerves and maintain it. Or stem cells that can be replicated into any as mention or more.
Answer:
Noble gases are likely to be least reactive, because they have complete octet in their valence shell.
Halogens are likely to be most reactive, because they want only one electron to complete its octet in their valence shell.
Oxygen is released during photosynthesis during the light phase of photosynthesis.
In an experiment, the group of test subjects left untreated or unexposed to some procedure and then compared with treated subjects in order to validate the results of the test