I believe the 3 main parts that make a virus would be its Nucleic content - DNA and or RNA, A protein coat surrounding the nucleic acid called a capsid, and the tail used for injecting viral genome into the host cell.
Answer: B
Explanation:
An endangered species is a species thats on the verge of extinction meaning it will be wiped out completley
Metastasis will happen and cancer cells invade nearby healthy cells, tissues, lymph nodes, organs or will migrate to distant organs.
The two different types of stem cells broadly classified as are Embryonic stem cells and adult stem cells. Embryonic stem cells are obtained from the blastocyst layer of the embryo and are pleuripotent. Whereas adult stem cells are the undifferentiated cells from tissues of an adult or a child. They can be unipotent or multipotent.
Explanation:
Cancer cells migrate to other parts of the body via blood and lymphatic system. This is called as metastasis. Cancer cells when becomes tumour they develop their own blood vessels and obtain nutrients from them. Once the tumour gets big it pushes the normal healthy cells of the neighbouring tissues and keeps on spreading.
Stem cells obtained from the embryo can differentiate into any types of cell and when grown in-vitro can dramatically form the three germ layers.
The adult embryo cells are found in less quantity, their role is to repair the tissue they reside in.
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Classification is subject to change because science is an evolving subject. New things are discovered every year and thus changing the way we understand the world around us.
