Answer:
2.5 mg
Explanation:
<em>The half-life of a substance is the time required for one half of the substance to decay. In order words, it is the time it will take for a substance to decay into half of its initial size.</em>
For a 20 mg element with a half-life of 30 which decays over a period of 90 years;
The first 30 years, 10 mg would have decayed, remaining 10 mg
The second 30 years, the remaining 10 mg would have decayed to 5 mg
The third 30 years, 5mg would have decayed to 2.5 mg.
Hence, in 90 years, 20 mg of the element would <u>remain only 2.5 mg.</u>
Answer:
Woman's genotype is AO
Man's genotype is BO
Explanation:
For a woman with blood group A and a man with blood group B to give birth to a child with blood group O. Their genotypes will be:
Woman's genotype is AO
Man's genotype is BO
The can have a child with blood group A, B, AB and O
1/4 will have type AB blood group;
1/4 will have AO, which is type A blood group;
1/4 will have BO, which is type B blood group;
1/4 will have OO, which is type O blood group
The structure of the ear can be divided into three main parts: the outer ear or pinna<span>, the middle ear and the inner ear.
Hope this helps :)</span>
Answer:
e. separation : clustering
Explanation:
When the two sides of the membrane have an unequal buildup of charged particles, there is a charge separation on either side of the membrane. One side of the membrane becomes positively charged while the other becomes negatively charged. This also occurs during resting potential when the cytosol present close of the membrane of the neurons become negatively charged with respect to the extracellular fluid present on the other side of the membrane. This allows the accumulation of oppositely charged particles (here, the positively charged particles in the inside) across the membrane.
