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D: studying how the mayfly population affects the number of trout in a stream
Ecology is the study of organisms and how they interact with the environment around them.
Mayflies provide direct and indirect services to humans and other parts of both freshwater and terrestrial ecosystems.
About 20% of mayfly species worldwide might have a threatened conservation status due to influences from pollution, invasive alien species, habitat loss and degradation, and climate change.
Thus, option D. is correct.
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The answer is:
D.) studying how the mayfly population affects the number of trout in a stream
If its correct, I'm happy to help XD
a. True
b. False
Answer:
a. True
Explanation:
The atomic radius is taken as the half of the inter nuclear distance between two atoms that are covalently bonded.
Across a period, the atomic radii usually decrease progressively because the nuclear charge(number of protons in the nucleus) increases without the increase in the number of electronic shell. Therefore, the electrons are pulled more to the nucleus.
Down a group, the effect of the nuclear pull is reduced because the number of electron shell increases and the nuclear charge is being compensated for.
Adjusting the proportions of substances in an alloy can significantly alter its physical and chemical properties, including hardness, boiling point, physical strength, and resistance to corrosion. These changes can cause phenomena such as rusting or shifting in acidity.
Changing the proportions of substances in an alloy impacts its properties. For instance, changing the ratios of iron, carbon, nickel, and other elements in steel, an alloy, can affect its physical strength and resistance to corrosion. It's crucial to understand that in any alloy, the relative compositions of different elements produce the character of the alloy. For example, in steel, altering the amount of carbon can change the hardness and tensile strength of the final product.
It's also important to know about the law of multiple proportions in chemistry. This law states that when two elements react to form more than one compound, a fixed mass of one element will react with masses of the other element in a ratio of small whole numbers. In alloy formation, these proportions of mass can significantly affect the properties of the resulting alloy.
Physical and chemical properties, such as hardness and boiling point, can be altered by changing the proportions in an alloy. These shifts can lead to both physical or chemical changes, such as melting, freezing, rusting, or even changes in flammability and acidity.
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Matter when broken down into its simplest parts forms elements. These are pure substances that everything in the universe is composed of. The smallest unit of an element is an atom, and when two or more atoms combine, a molecule is formed.
When matter is broken down into its simplest parts, it forms elements. Elements are the pure substances that everything in the universe is composed of and they cannot be broken down further using ordinary chemical reactions. Examples of elements include hydrogen, oxygen, carbon, nitrogen, calcium, and iron.
The smallest unit of an element is an atom, which is made up of subatomic particles like protons, electrons, and neutrons. When two or more atoms combine, a molecule is formed. Molecules are the smallest particles of matter while still retaining their chemical properties.
Elements in nature are unique with specific chemical and physical properties. Currently, 118 elements are known, but only 98 occur naturally. The remaining are synthesized in laboratories due to their instability.
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b. 80,000 units, because total energy remains unchanged
c. 20,000 units, because total energy of the skier decreases
d. 80,000 units, because total energy of the skier decreases
Answer:
30,000 units, because total energy remains unchanged.
Step-by-step explanation:
The law of conservation of energy states that energy cannot be destroyed, it remains conserved but transforms from one form to the other form.
Hence, we can say that
Total energy = kinetic energy (KE) + potential energy (PE).
At 100 meters above
Total energy = 0 + 50000 = 50000 units.
Hence, 60 meters, total energy would be
20,000 + x = 50000 units
Finally,
x = 50,000 - 20,000
= 30,000
The energy will only transform from one form to the other but will not change.
off after 15 days​