I believe the correct answer is B. Vibrate with the frequency of the received sound.
<h2>Explanation:</h2>
The ear is divided into 3 sections: The outer ear, the middle ear and the inner ear. The outer ear is funnel shaped leading into the head to collect sound waves and concentrate it to the middle ear. The middle ear contains the eardrum (tympanic membrane) which vibrates in response to the sound waves.
<h2>Further Explanation:</h2>
The middle ear contains the eardrum(tympanic membrane) which is a special type of membrane that is thin and taught to vibrate to the slightest sound waves. When the sound waves cause the vibration of the tympanic membrane depending on different frequencies, it will cause the 3 bones attached to it ( malleus, incus and stapes) to vibrate at the frequency the membrane vibrated. This motion will cause the round window of the inner ear to vibrate at the same frequency. The round window is connected to a structure called the organ of corti that contains many very sensitive hair cells. The inner ear is filled with fluid including the organ of corti. The vibration of the inner ear is transmitted into this fluid and the back nd forth motion of the fluid will cause vibrations on the hair cells in the base of the organ of corti. These cells are specially adapted and transmit the vibrations as electrical signals to the sensory neurons attached to them. These neurons then will carry the converted sound energy to the brain via major cranial nerves where the brain will interpret these signals as sound waves. Interpretation is continuous and very fast and that is why a person can hear things simultaneously. These hair cells are the ones that get destroyed when listening to loud music making a person go deaf. Bomb blasts and gunfire sound also tear the tympanic membrane and the destroy the sensory cells and this is why many war veterans have hearing problems.
Level: High School
Subject: Biology
Topic: Movement and Coordination
3-PGA is the important metabolic intermediate in light independent reactions of photosynthesis.
PGA
<u>Explanation:</u>
Light-independent reaction in photosynthesis is called Calvin cycle and the reaction doesn’t directly require sunlight. But it still needs the products of light reaction. In light-independent reaction carbon dioxide is fixed from inorganic form into an organic form.
In the fixation each molecule of carbon dioxide reacts with RuBP and forms two molecules of 3-PGA at a time. The reaction is catalyzed by the enzyme RuBisCO. Since 3 molecules of RuBP are involved a total of 6 molecules of 3-PGA will be formed in fixation.
Here the 3-PGA is the intermediate and in the next stage it will get reduced to G3P(Glyceraldehyde -3 phosphate).
Answer: Amphibians and water animals.
Explanation:
Answer:
Early in gestation, a fetus has a cartilaginous skeleton that becomes bone in ... At birth, a newborn baby has over 300 bones, while on average an adult human has 206 bones ... It is composed of fibers and granular cells in a matrix. ... The hypertrophic chondrocytes (before apoptosis) secrete vascular endothelial cell growth ...
Explanation
n:When does the fetal cartilage turn to bone?
Key milestones in fetal bone development
Weeks pregnant Milestone
7 weeks Bone outlines for entire skeleton established; cartilage is forming
8 weeks Somites disappear; joints start forming
10 weeks Bone tissue forms and starts hardening (ossification)
16 weeks Your baby can move his limbs