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hoa [83]
3 years ago
9

which system is responsible for defending the body against harmful substances? A circulatory system B muscular system C endocrin

e system D immune system
Biology
2 answers:
kicyunya [14]3 years ago
6 0
D) the immune system
balandron [24]3 years ago
3 0
D, the immune system is responsible for defending the body
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A balance is used for measuring mass._______-__  

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What is the same about the electronic structures of lithium and sodium?
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Answer:

Sodium and lithium are in the same group of the periodic table; this is because they both have the same number of electrons in their outer shell (1 as indicted by the group number). this commonality is the reason they have similar chemical properties. As we go down the group however, the electronic structure of atoms of an element changes as that there are a increasing numbers of ‘shells’.

Electron ‘shells’ are filled according to ruled of quantum mechanics however to simplify things in this case the first shell can fit 2 electron, the second 8, and the third shell 8. Lithium has 3 electrons, hence it the first shell is filled, and 1 electron occupies the second shell. Whilst Sodium has 11 electrons, hence its first two shells are filled and the third shell is occupied by one electron.

To expand on this question, the duet/octet rule is a rule in quantum mechanics that observes that main group elements tend to be stable with a full outer shell.

This explains why sodium and lithium is found in the form of Li+ and Na+ ions in nature.

Explanation:

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3 years ago
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How is slump different from creep ​
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Answer:

Creeps and slumps are very similar. They are both a form of mass wasting and have the same causes. The difference between a creep and a slump is that a creep moves slowly and gradually while a slump is faster and causes more drastic changes in terrain.

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3 years ago
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Pharmacist are experts in medicine. Which branches of science do pharmacists need to know in order to do there job properly?
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The answer would be Biology and Chemistry.  Although they do use a little bit of physics, it's mostly chemistry and biology.
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In a relatively small iguana population the allelic frequency is tracked for three generations. Webbing is a recessive allele; n
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This is an example of founder effect.

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Founder effect may be illustrated as the loss of genetic variation in a novel small population originated from the original population. The concept was initially presented by Ernst Mayr. It can be seen that genetic diversity has got reduced in the population of iguana due to the result of the flood that has washed all the iguana without webbed feet into the sea.  

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