Anaerobic respiration was very weak because the earth had no harmful chemicals in the air at the time
Answer:
Some major functions of skeleton are below
Explanation:
Support and shape
bones support soft tissues and serve as attachment site for most muscles and provide shape to the body
Protection
Bones protect critical internal organs, such as brain, spinal cord, heart and lungs.
Movement
skeletal muscles attached with the bones help in moving the body
Mineral homeostasis
Bones serve as store for calcium phosphorus potassium sodium. Through negative feed back mechanisms bones can release and take up minerals to maintain homeostasis
Blood cell production
red and white blood cells are produced in bone marrow, a connective tissue found within bones
<span>Epithelial tissue is densely packed cells that used most in the area where protection is needed. This cells mostly used in skin, some with more keratin which will increase their ability to protect. In bone, the main protective layer is calcium mineral which was deposited by osteocytes. Because this bone doesn't really need more epithelial cells. Bone tissue only needs a good vascularization and connective tissue to support it.
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Answer: D. at most 10
Explanation:
Using the energy pyramid, the ratio of grassland to primary consumer to secondary consumer is: 100:10:1 respectively.
Thus if the grassland supports 100 cattle (primary consumer), the numbers of humans (secondary consumer) the cattle can feed will be;
100/10 = 10.
Answer:true
Explanation:
Because we already used the oxygen from the blood to breathe (i think)
