The level of organization that the endocrine system is known as the organ system. While the level of organization in which the digestive system is is known as the organ system.
<h3>What is the level of organization?</h3>
The level of organization may be defined as the collection of structures in nature that are usually defined by part-whole relationships, with things at higher levels being composed of things at the next lower level.
In living organisms, a cell is the basic fundamental structural and functional unit of life. Cell initiates the level of organization in the manner as follows:
- Cell < Tissue < Organ < Organ system < Organism.
With this aspect, the endocrine system and the digestive system consist of a series of organs, so both of the systems fall under the category of organ system at the level of organization.
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<span>In the question,'when a doctor is able to determine the sex of the foetus, during an ultrasound scan, what stage of development is the foetus in, the correction option is D, that is, the second trimester. Human pregnancy usually lasts for an average of nine months. The nine months are divided into three parts of three months each called trimester. The first trimester is made up of the first week of the pregnancy to the twelfth week. During this period, the foetus is just developing and can not be picked up easily by an ultrasound scan, but by the second trimester, which is week thirteen to week twenty four, the foetus would have develop enough to be picked up by the ultrasound scan. At this stage, the doctor can easily determine the sex of the foetus whether it is a boy or a girl.</span>
Glycolysis occurs in all cells and can take place either with or without oxygen present.
Glycolysis occurs in the cytosol of the cell and it is the process where glucose is broken down by enzymes thus releasing energy and pyruvic acid.
This process requires an electron carrier molecule called NAD+ which absorbs an electron.
The correct option is A.
A density independent factor refer to a weather or climate condition, which exert its influence on a population size without regard for the size of the population and its density. Limiting factor refers to any factor that put a limitation on the growth, abundance or distribution of a population. In the question given above, the Hurricane Katrina is a density independent factor because the hazardous event affected all the people that are resident in the affected areas.