Answer:
Cause they are heavy and th as a lot of fat it protein
<span>B. organ systems, organs, tissues, cells
Organ systems are the most complex in this grouping, they are made up of multiple organs, tissues and cells all working together with other organ systems to keep an organism alive. Examples of organ systems are the digestive system, respiratory system, nervous system. Organs are groups of tissues and cells working together with a main purpose. Examples of organs are heart (pumps blood), brain (controls the body), stomach (digests food). Tissues are groups of cells working together as a whole such as cardiac tissue, adipose tissue and blood. Cells are the smallest unit of life, in groups they form tissues and organs. Cells of the body include neurons, blood cells, skin cells, and fat cells.</span>
Global Warming is Human caused. Scientists have concluded that most of the observed warming is very likely due to the burning of coal, oil, and gases.
Heat detection is needed for breeding.There is a system called timed breeding or the appointment breeding which is made so that the onset of heat and ovulation are induced for an animal to be inseminated at the right time. These then will help the breeder as well as the owner.
If one trophic levels population increases or decreases too much, it can decrease the amount of producers, this decreasing the amount of energy available in food web which can cause population crash.
