_________ level is the highest level of organization in animals.

Explanation

In Biology, animals are organized into different levels of organization. These levels range from the simplest to the most complex. The question is asking for the highest level of organization in animals. The options given are System, Tissue, Organ, Cellular, and Protoplasmic. System, which is Option A, is the correct answer. The System level is the highest level of organization in animals. It is the level where different organs work together to perform a specific function. For example, the digestive system is made up of different organs such as the stomach, liver, and intestines, which work together to break down and absorb food. Tissue, which is Option B, is the level below the System level. Tissues are groups of cells with similar structures and functions. Examples of tissues include muscle, nerve, and connective tissue. Organ, which is Option C, is the level above the Tissue level. Organs are made up of different tissues that work together to perform a specific function. Examples of organs include the heart, lungs, and brain. Cellular, which is Option D, is the level below the Tissue level. It refers to individual cells, which are the basic unit of life. Protoplasmic, which is Option E, is the lowest level of organization in animals. It refers to organisms that are made up of a single cell, such as bacteria and protozoa. In summary, the answer to the question is Option A, System, as it is the highest level of organization in animals. For more information, please see the recommended textbooks.