Enzymes are catalysts, meaning that they are proteins that speed up reactions. So without them, there would be barely any activity.
Minerals in a rock becoming powdery and rusty is a chemical reaction, thus is Chemical Weathering.
Sickle cell mutation is most common in Africa and southern half of Europe. The reason for this is because, natural selection made areas with high concentration and history of diseases such as cholera, tuberculosis, yellow fever, and much more.
Answer:
cell wall, chloroplasts
Explanation:
Only plants have a cell wall and chloroplasts.
Answer:
<em><u>The correct option is B. bacteria</u></em>
Explanation:
Nitrogen-fixing bacteria can be described as bacteria which convert atmospheric nitrogen into a form which is usable for the plants. Without these bacteria, the process of recycling of nitrogen would not be possible. More than 90% of the nitrogen fixation is done by these microorganisms. Nitrogen fixation converts the nitrogen of the atmosphere into ammonia or other nitrogenous compounds which are usable by the plants. The nitrogen-fixing bacteria might have symbiotic relationships with plants.