I think it is natural selection. genetic variation also could be a factor for physical variation over the years.
You should wear tight compression outfits to decrease the possibility of drag, especially in an olympic race. You could even wear a swim hat to lower drag from your hair.
Crossed extensor reflex action prevents one from falling when your foot catches while walking.
Crossed extensor reflex:
- A withdrawal reflex is the crossed extensor reflex. In the withdrawing limb, the extensors relax while the flexors contract, but in the other limb, the opposite happens.
- Contralateral means that the crossed extensor reflex takes place on the side of the body that is opposite from the stimulus.
- Afferent nerve fiber branches travel from the stimulated side of the body to the opposite side of the spinal cord to cause this response.
- They connect with interneurons there, which then stimulate or inhibit alpha motor neurons to the muscles of the opposing leg.
Learn more about the Reflex action with the help of the given link:
brainly.com/question/17212995
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B since life cant always be the same and the other 3 you can control and look after
Answer: Fever over 101 fahrenheit
Illness of two weeks
Explanation:
Explanation:Fever is an indication of infection in the body, normal human body temperature is 98.6 Fahrenheit or 37 Degrees Celcius.if the temperature is above that she must visit the doctor. Runny nose could be a sign of cold, influenza, Allergic rhinitis, sinus problems, nasal infections, or other upper respiratory illness. Decreased appetite is due to the presence of infection in her body. she is exsausted because of runny nose causing dehydration in her body and that is why she does not want to get out of bed.
Fever over 101 Fahrenheit for two days and illness of two weeks is the best answer
