Answer:
circle vs eclipse - down below!!
Explanation:
a circle has the same distance between a center, but an eclipse does not have the same distance between a center. AND, an circle has a fixed radius that stays solid, but a eclipse does not.
More than 75 percent
Explanation:
Let us carefully analyze this problem:
The half life of the rubidium isotope = 50 billion years
The half-life of a radioactive isotope is the time it takes for it to decay to half of its original amount.
Every 50years, we know that a rubidium isotope would split into half.
Initially when the isotope was formed, we would only have the parent atoms there. There wont be any daughter;
ratio of parent to daughter = 100 : 0
When the isotope decays to half; we would have equal number of parent and daughter:
ratio of parent to daughter at half life = 50 : 50
The age of the earth is about 4.6billion years;
this is;
x 100 = 9.2% of the half-life of the rubidium isotope.
At this time, we should know that only 9.2 percent of the daughter would have been formed.
The remaining parent would be 100 - 9.2 = 90.8% would still be left undecayed.
The ratio of parent to daughter = 90.8 : 9.2
This is more than 75% of the parent
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Answer:
Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells. Egg cells all contain an X chromosome, while sperm cells contain an X or Y chromosome.
Explanation:
Warm, humid, growing, part of United States with important oil discoveries - <u>South</u>.
Northern part of this peninsula is heavily populated, near San Diego - <u>Baja California</u><u>.</u>
Vast forests and active volcanoes in the United States - <u>Pacific Northwest</u>.
Includes area around the American and Canadian shores of the Great Lakes - <u>Midwest</u>.
<h3>What is a sub-region?</h3>
This refers to the conceptual unit which derives from a larger region or continent and is usually based on location.
For instance, in the United States, the subregion of the country includes the Pacific Northwest, Midwest, Baja California, South etc.
Therefore, in this question, the sub-region were used to locate the region where we have:
- Warm, humid, growing, part of United States with important oil discoveries
- Northern part of this peninsula is heavily populated, near San Diego
- Vast forests and active volcanoes, in the United States
- Includes area around the, American and Canadian shores of the Great Lakes.
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