Corrosion: Rain and acid rain
<span>Breaking due to freezing and thawing: Temperature
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Answer:
A) a single variable
Explanation:
An appropriately designed experiment usually involves only one independent variable. This allows the scientist to truly determine whether the variable manipulated is what had an effect on the subject. You may test more than one variable, but this is usually done or experimented separately, or one at a time.
The number of molecules in some water isn't affected by changing its temperature. But to know if you have the same number of molecules in two water samples, you need to compare their masses, not their volumes. When you heat some cool water, it expands. (When you slightly warm some ice-cold water, it contracts a little, but let's keep this simple.) So hot water takes up more space than cold water. The amount of space something takes up is called volume. If you were to have 2 cups of water, one of hot water and one of cold water with equal volumes, the cold water would have more molecules.
<span>Hot and cold water are made of the same type of molecules. Each molecule has one oxygen and two hydrogen atoms. The difference between them is the speed of the molecules jiggling around. </span>
Answer:
Monocots, dicots, tap roots
Explanation:
Higher plants possess root as one of their structural components. These root exist in two systems; Fibrous root is a root system possessed by monocotyledonous plants e.g grasses while tap root system is possessed by dicotyledonous plants e.g Carrot plant.
The fibrous root system is a branched root system. A diverse network of root is formed on the topmost layer of the soil, thus, help in anchoring the plants to the ground surface. The tap root system, in contrast, is a thick main root that grows downwards, penetrating deep into the soil. Smaller roots emanate from the side of this main tap root.
According to the question, in an habitat what most of the water can be found deep in the ground, a root system that grows and penetrate deep into the ground will be best in order to assess the water. Hence, a tap root system is bette adapted for this function.
Genetic variation allows for a greater chance of a population surviving. For example, if a plant species acquires a disease, without genetic variation the disease would just keep getting passed on to the next identical organism and the population would decline and eventually die. But genetic variation prevents that from happening, because you have so many other species in the ecosystem, and genetic variation is a product of sexual reproduction meaning that the offspring of the diseased plant has a possibility of not inheriting the disease.