Adenine, Thymine, Cytosine & Guanine
<span>Composition. (We use the crust-mantle-core terminology to describe differences in chemical composition in Earth's interior. We use the lithosphere- asthenosphere terminology to describe differences the physical state and behavior. Note that the boundaries between layers with different compositions do not occur at the same depths as the boundaries between layers with different physical properties. For example, there is a change in composition when passing from crust into mantle. But there is no change in physical state or behavior at this boundary- the uppermost part of the mantle behaves in the same way that the crust does because it is still far enough below its melting temperature to be a rigid, brittle solid. The transition to a softer, more pliable solid occurs further down within the mantle and this change in behavior occurs with no change in composition.)</span>
Water cycles through organisms and rivers.
The estauries are characterized by mix of fresh water and salt water. That is option A
<h3>What is estauries?</h3>
Estauries is defined as the part of water where many rivers meet and sweep into the ocean.
The characteristics of estauries include the following;
- The salty water mixed with freshwater resulting to brackish water formation.
- The gradient of salinity in a semi-enclosed coastal system.
Learn more about brackish water here:
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Which feature is characteristics of estauries:
A mix of fresh water and salt water.
swap-like land.
region of land that drains into a body of water.
the gradient of salinity in a semi-enclosed coastal system.
Answer:
4
Explanation:
Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.
