The correct answer is (B) Photosynthesis and diffusion from the air
Dissolved oxygen enters the water from photosynthesis and through air. The The aeration of water can be caused by wind. From the air oxygen diffuse into the water and gets mixed in the it through circulation. The oxygen is also produced as a waste product of photosynthesis from blue-green algae, phytoplankton, etc which is added in water.
<u>ANSWER:</u>
The correct option is B- Qualitative.
<u>EXPLANATION:</u>
When the growth of corn has to be recorded, the quality of the corn grown in different soils needs to be recorded. Qualitative methods are best used to classify quality of anything.
Qualitative data basically is non-numerical data which in the case of corns can be the length of the corn plant, the sweetness of the corn kernel or the hardness or softness of the corn. This data cannot be recorded using numerical values and so other methods of data recording cannot be used.
Answer:
Platismatia is a genus of lichens that often is found in forests. Lichens may be beneficial for forests because they provide food and nutrients for other species by fixing atmospheric nitrogen
Explanation:
The lichens are the result of mutualism between photosynthetic organisms (algae or cyanobacteria) and fungi species.
<u>Answer</u>: Thermal energy----> a polar bear breaks down stored fat to increase its temperature.
Mechanical energy-------> bat emits and receives sounds to locate prey.
Electrical energy------>eel releases a current to defend itself.
Radiant energy --------> a firefly produces a green glow from its abdomen to attract mates.
<u>Explanation</u>:
- <em>Thermal energy</em> is the energy created in the movement of particles that leads to the production of heat and thus, the temperature increases. Since the polar bears break down fat to increase temperature, the energy generated is thermal energy.
- The<em> mechanical energy</em> is defined as the sum of energy of motion and the position of an object . Thus the energy produced by the bat to locate its prey is mechanical energy.
- The energy associated with the production of electromagnetic radiation is<em> radiant energy,</em> thus the glow produced by fireflies is a form of radiant energy.
- The energy produced due to the movement of electrons is electrical energy. Thus, the energy produced by an eel in the form of electric current is <em>electrical energy.</em>
