Answer:
D, core
Explanation:
The outer core is located just below the mantle. It is made of liquid iron and nickel. Scientists believe this layer is responsible for the Earth's magnetic field. It is about 2,200 kilometers thick and around 4,500 degrees Celsius.
Answer:
By counting stars.
Explanation:
During the late eighteenth century, there was an astronomer - William Herschel who tried to estimate the size as well as shape of the galaxy by on the sky. It was the time when astronomers didn't even know that there exist some galaxies outside the milky way. He counted all the stars and created a map of the galaxy.
However, in that attempt he didn't realize that stars he was counting were not clear from his view. With that attempt of incorrect nature, he concluded his work as, the galaxy is disk-shaped, flat and contains sun at the center. Today, when the astronomers got a perfect idea of the vastness of the universe and galaxies, we are in a position to say that Herschel's idea of the galaxies was very tiny and underestimated.
Answer:
Explanation:
Lets take an example of human primates -they communicate in a diverse way in their life cycle using gesture ,posture ,vocals ,expressions etc . The the humans are in their infant stage they cry when they feel hunger . No one teaches them to do so these are naturally done by then through natural instincts .They expresses their anger by making sounds . As we grow up we use all of our sense organ to communicate with the organisms and the environment . We uses verbal as well as non verbal communication depending upon the need . Human primates uses diverse ways to communicate ,visual expressions and gestures also speak alot .
communication increases fitness within the species as they talk about their need . Through communication only relationships and interactions established among primate. This can be used to communicate information among members of a troop that can increase the fitness of a collective group . As we know that as a community we share responsibilities ,so if the communication is strong life expectancy increases in many primates (such as monkey , tigers and dears ) .
Answer:
the answer is B. Antigenic drift
The kidneys filter the blood to remove wastes and produce urine. The ureters, urinary bladder, and urethra together form the urinary tract, which acts as a plumbing system to drain urine from the kidneys, store it, and then release it during urination.
