If a star is 300 light-years from Earth, it will take 300 light years from that star to reach Earth. So, the correct option is A.
A light year is defined as the larger unit of length used to express astronomical distances which is approximately equal to 9.46 trillion kilometers or 5.88 trillion miles.
A light year is explained as a measure of distance and not as time where light travels at a speed of 300,000 km/s where the distance that light will travel in one year is considered as a light year which is 9.4611012 is equal to km. When a star is 300 light-years from Earth, it will take 300 light years from that star to reach Earth.
Therefore, the correct option is A.
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Your question is incomplete, most probably the complete question is:
If a star is 300 light years away from Earth, how long does it take light from that star to reach Earth?
A. 300 light-years
B. 300 years
C. 300 hours
D. 300 days
passed to offspring must occur
Answer:
Germ cell DNA
Explanation:
mutations that are present in other body cells do not get passed onto offspring. if the mutations are present in a germ cell it does get passed onto offspring
Answer:
same DNA bases and HGT
Explanation:
Even though we are different species, so much as different kingdoms, the DNA is always going to be the molecule that contains our genetic information and constitute our genes. This molecule is made up by the same structure: a sugar, a phosphate and a base like adenine, guanine, cytosine, thymine. Regardless if its a human, bacteria, fungi or a plant cell we all share this in common.
It is well known that we acquire our whole set of genes from our ancestors but some studies have shown that we also acquire genes from other organisms and its called horizontal gene transfer (HGT). HGT involves the movement of genetic material between different species. Since we've been sharing the world with a lot of prokaryotic organisms we might have experienced the HGT at some point of the evolution, and since our genetic material is made up of the same molecules, we can have the same subsets of genes working in both organisms.
Answer:
The subset of genes shared by humans and prokaryotes originates from a common ancestor and has been retained over billions of years of evolution.
Explanation:
This is was the right answer on my teachers test.
-1 time
-2 times
- multiple times
Answer:
- multiple times
Explanation:
Blastopore is a term used in embryology to refer to an extremity that acts as a means of communication in the embryonic phase, bringing the digestive cavity into contact with the external one. The blastopore forms in the embryonic gastrula period, at which stage cell differentiation begins. Later, another extremity may arise, also during embryonic formation.
Depending on the group to which the animal belongs, this orifice may primarily perform the mouth function - as is the case with protostomies - or initially act as anus of the organism - in the case of deuterostomies.
In either case, we can say that throughout evolution the final detecting of blastoporos has changed several times.
How many times has blastopore fate changed over the course of evolution1 time
b) 36%
c) 66%
d) 58%
e) 24%
Answer:
Option C, 66%
Explanation:
Zoonotic pathogens are the ones which are transmitted from animals to human beings.
As per the study of world health organisation, nearly 61% of human diseases caused by pathogens are due to Zoonotic pathogens. This percentage has increased from last ten decades to 75%.
As per Center for Disease Control and prevention, more than 50% pathogens are Zoonotic pathogens
These pathogens can enter human being through various medium such as air, water, contaminated food, hand or mouth contact etc.
Some common examples of disease caused by zoonotic pathogens are -
Malaria, dengu, Typhoid etc.
Hence, option C is correct