Answer:
Desert animals must cope with two things; temperature extremes and lack of water.
Explanation:
Therefore, most adaptations in desert animals, while they may seem bizarre, serve the purpose of helping that animal cope with these two problems. Both are important. Water is necessary for life, and balancing the water budget is essential for desert animals.
Answer: Explanation:
All males possessing an X-linked recessive mutation will be affected, since males have only a single X chromosome and therefore have only one copy of X-linked genes. All offspring of a carrier female have a 50% chance of inheriting the mutation if the father does not carry the recessive allele.
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Answer:
The movement of air through Earth's — or any planet's — atmosphere is called wind, and the main cause of Earth's winds is uneven heating by the sun. This uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.
Explanation:
The movement of air through Earth's — or any planet's — atmosphere is called wind, and the main cause of Earth's winds is uneven heating by the sun. This uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.
Answer:
Age of rock = 500 million years
Explanation:
The age of the rock can be calculated by determining the number of decays (half-lives) the parent rock has undergone.
The half-life of a radioactive material is the time it takes for half the the quantity present in that material to decay or disintegrate.
The half-life of the rock sample = 250 million years
Amount of parent rock left in the rock sample = 25% = 1/4
Number of half-lives, n required is given as (1/2)ⁿ
Number of half-lives undergone by the parent rock sample to be 1/4 of the original sample is given as: (1/2)ⁿ = 1/4
1/4 = (1/2)²
Therefore, n = 2
Age of rock = number of half-lives * half-life (in years)
Age of rock = 2 * 250 million years
Age of rock = 500 million years
