Answer:
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Humans backing OFF. that saved them
D repeated rising and lowering the water table
Solution:
It is the system of earth with orbiting satellites, transmitting signals continuously towards the earth,which enable the position of receiving device on near the earth's surface to be accurately estimated from the difference in arrival times.
The Earth system has always changed. But right now it has an additional pressure forcing change: human activites. This force is now global and dominant. The response of the Earth system to this pressure is an important area of science. Which are as follows:
• Oceans
• Land
• Cryosphere
• Life
This is the required right answer.
Answer:
Hydrogen bond
Explanation:
The α-helix and the β-pleated sheet are secondary protein structures. They are formed within a polypeptide due to interactions between the atoms of the backbone.
Both the alpha helix and beta pleated sheets are held in shape(stabilized) by hydrogen bonds which form between the carbonyl (C= O)of one Amino acid and amino(N-H) of another amino acid.
This bonding is gives them their structure.
