The circadian rhythm is a cycle that involves multiple that involve physical, mental, and behavioral changes occurring during a day time period of time. Therefore, only changes occurring in a 24 hours span are considered part of the circadian rhythm. Two examples are the body temperature following a regular pattern of increases and decreases each day, and the body secreting the hormone melatonin at night. A healthy person experiences a change in its body temperature of about 0.5 °C each day, with the lower temperature occurring in the morning and the higher temperature occurring at night. Regarding the hormone melatonin, the body secretes this hormone during night and helps people to relax and sleep.
<em>A circadian rhythm /sɜːrˈkeɪdiən/ is any biological process that displays an endogenous, entrainable oscillation of about 24 hours. These 24-hour rhythms are driven by a circadian clock, and they have been widely observed in plants, animals, fungi, and cyanobacteria.</em>
b. Hiccupping is a vestigial reflex that suggests a common ancestry between humans and amphibians.
Explanation:
Hiccupping refers to an involuntary contraction of the diaphragm that usually occurs several times per minute. Some research has suggested that hiccuping is an evolutionary remnant of amphibian respiration. This is because the mechanism is remarkably similar to the way tadpoles gulp air and water across their gills. This would mean that hiccups exist due to an antecedent to modern lung respiration.
Since ribosomes produce proteins, and the endoplasmic reticulum transports the proteins that the ribosome makes it is advantageous for a protein secreting sell to have ribosomes on the endoplasmic reticulum so that the proteins can be transported more quickly and efficiently
Gases and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
