Answer:
jawless fish were earth 's first arthropods
Answer:
Human beings are not the only living things with cells. Cells are the smallest makeup of basic life in the hierarchy, and since humans are not the only form of life, there is definitely other life being made up of cells.
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.