Answer: Mutations are the most fundamental way to add new genes to a gene pool.
Explanation:
A mutation is either permanent or temporary changes that may occur in the DNA sequence of the organism that makes up a gene which is the functional unit in the organism. These mutations will add genetic variations in the gene pool of the population. Those mutations which are hereditary which means they can be transmitted from parents to offsprings are called as germline mutations.
Acquired (somatic) mutations are those mutations which occur's during a persons life. These mutations occur due to ultraviolet radiations. These mutations occur in the somatic cells not in the germ cells therefore, these cannot be passed from one generation to the next.
(1) Most of the species that have lived on Earth
no longer exist.
(2) Most of the species that have lived on Earth
still exist today.
(3) Fossils of species that never existed can be
found.
(4) Fossils of species that never existed, but will
exist in the future, can be found.
Answer:
(1) Most of the species that have lived on Earth no longer exist.
Explanation:
Fossil describes the remnant or trace of animals or plants in a geologic age that is preserved in the Earth's crust. It can be studied to give a fossil record, which is an evidence of past existence of a plant or an animal.
Fossil record is the history of life of an organisms documented by fossil that has been preserved in rocks. It helps paleontologists, archaeologists, and geologists to make accurate predictions about events and species.
Scientists believe that almost 99.9% of species of different organisms that have lived on Earth are now extinct. Therefore according to fossil record, most of the species that have lived on Earth no longer exist.
Answer:
A) research the information using several sources before taking the supplement.
Explanation:
True
False
Science
Scientific American
Natural History
Answer:
The correct answer is b. melanin
Explanation:
The various pigments and nutrients which are found in a cell but are not organelle because they do not perform activities like organelle perform are called cell inclusions. Some of the examples of cell inclusions are lipids, melanin, lipids, etc.
Therefore melanin is considered as inclusion. Melanin is produced by specialized cells called melanocytes from where it gets transported to skin and hair which provided the skin and hair its color. Therefore the right answer is melanin.
Melanin is an inclusion, not an organelle.
An organelle is a specialized structure within a cell that performs specific functions. Based on the options given, melanin is an inclusion, not an organelle.
Melanin is a pigment found in the skin, hair, and eyes, responsible for color. It is not a specialized structure within a cell like lysosome, cilia, and microtubule, which are all organelles.
In conclusion, the correct answer is melanin.
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