Answer:
The leukocyte, commonly known as a white blood cell (or WBC), is a major component of the body’s defenses against disease. Leukocytes protect the body against invading microorganisms and body cells with mutated DNA, and they clean up debris. Platelets are essential for the repair of blood vessels when damage to them has occurred; they also provide growth factors for healing and repair.Although leukocytes and erythrocytes both originate from hematopoietic stem cells in the bone marrow, they are very different from each other in many significant ways. For instance, leukocytes are far less numerous than erythrocytes: Typically there are only 5000 to 10,000 per µL. They are also larger than erythrocytes and are the only formed elements that are complete cells, possessing a nucleus and organelles. And although there is just one type of erythrocyte, there are many types of leukocytes. Most of these types have a much shorter lifespan than that of erythrocytes, some as short as a few hours or even a few minutes in the case of acute infection.
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Explanation:
Answer:
A sharp knife can cut objects more easily compared to a blunt knife because a sharp knife applies more pressure on the object.
Answer:We see the Moon because sunlight reflects back to us from its surface. During the course of a month, the Moon circles once around the Earth. If we could magically look down on our solar system, we would see that the half of the Moon facing the Sun is always lit. But the lit side does not always face the Earth. As the Moon circles the Earth, the amount of the lit side we see changes. These changes are known as the phases of the Moon and it repeats in a certain way over and over.
Explanation:
the age of Rock in years is called its absolute age geologist find absolute age by measuring the amount of certain radioactive elements in the rock
An Environmental Activist is a broad term for someone who is actively engaged in fighting for the environment. It could even be said that both environmental lawyers and environmental journalists are environmental activists in their own rights. However, someone could still be an activist without being a journalist or a lawyer, and this activist may be involved in fundraising, petitioning, and actively protesting. Environmental journalism is quite self explanatory; to report though written and/or verbal media to spread information on issues pertaining to the environment. An environmental lawyer fights legal battles to ensure dangerous actions are prevented or held accountable, and may also impact future legislation regarding environmental management.
