Answer:
Limestones and coal are the types of rocks which are the example of organic type of sedimentary rocks.
Explanation:
These rocks are made from organic compounds that are dead remains of plants and animals. These are also known as fossil fuels. These takes a lot of time to be formed by the pressure of Earth. These rocks do not have much calorific value if they are burnt. Limestone can be used for many purposes like in buildings or any other infrastructure.
Coals are classified as non-renewable source of energy. Non-renewable source of energy is used once and take millions of years to be formed again. This fuels also cause air pollution which is harmful for humans and plants.
I don’t understand the question but if I can make a correct inference, they have thorns to protect themselves from predators.
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Answer:
Option-B
Explanation:
The brain is an organ composed of neurons which controls all the voluntary and involuntary of animals. In humans, the brain is located in the skull where the brain is suspended in a fluid called cerebrospinal fluid.
As humans ages and becomes old aged, the neurons in the brain losing their ability to perform their function, if they are lost they cannot be regenerated.
The lesions appear on the white matter of the brain and the brain shrink. Due to these known and other unknown features, the process controlled by these neurons become inadequate and shows slower brain processing and weak memory.
Thus, Option-B is the correct answer.
Answer:
They speed up chemical reactions. Without them you wouldn't be alive. They break down macromolecules, and also lower the amount of energy needed for a chemical reaction to happen.
