Answer: Located within the thermosphere, the ionosphere is made of electrically charged gas particles (ionized). The ionosphere extends from 37 to 190 miles (60-300 km) above the earth's surface. It is divided into three regions or layers; the F-Region, E-Layer, and D-Layer.
Explanation:
the answer for this question is the distance of the star from sun using parallax method
Answer: (1) photosynthesis occurred
Explanation: The photosynthesis process in cianobacteria changed the composition of earth's atmosphera, rising oxygen levels. This could be possible since photosynthesis used energy from the sun to produce energetic intermediaries to synthesize sugars, and as byproduct due to water photolisis, is oxygen.
Any sensation one receives activates <u>sensory neurons </u>which take the message to the brain for processing
Answer: Option D
<u>Explanation:</u>
The sensory neurons are the ones that are active for the five senses. They are present throughout the body. It activates immediately when a sensation like touch is felt. This sends information to the nervous system.
There are two sensory inputs;
- A physical input which can be felt by touch like fire, chillness.
- A chemical input like taste or smell. Sensory neurons are the transmitters that carry signal from the body skin to the nervous system.It sends these impulses to the central nervous system.
