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7nadin3 [17]
3 years ago
9

Which layer of the atmosphere reflects radio waves back to earth

Biology
2 answers:
suter [353]3 years ago
5 0

i'd say Thermosphere.

Setler79 [48]3 years ago
4 0
The ionosphere<span> can reflect radio waves directed into the sky back toward the Earth. </span>
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What harmful environment factors should be avoided by pregnant women ? Why ? Please answer this !!
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toxic substances can increase the risk for birth defect, miscarriages,etc.

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3 years ago
What is innate immunity? Discuss the barriers associated with innate immunity.
Rama09 [41]

Answer:

Innate immunity is a nonspecific defense mechanisms that play its role as soon as an antigen appear in the body (it is relatively rapid but nonspecific and because of that it is not always effective)

Explanation:

The barries of innate immunity are:

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Skin sweat or secretions: Their specific defense is sweat glands and sebaceous glands, and their protective aspect is low ph and washing action.

Mucosal surfaces: they are at the mucosal epithelium, and their protect aspects are nonkeratinized epithelial cells.

Oral cavity: They defend salivary glands through Lysozyme

7 0
3 years ago
ATG GGT CTA GCG AAA GAT IS WHAT AMINO ACID
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6 0
3 years ago
An individual's complete collection of genes is called his or her:
BabaBlast [244]

The right answer is genotype.

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7 0
4 years ago
__________, often caused by unsafe water and contaminated foods, leads to nearly 1 million childhood deaths each year. rubella s
Sveta_85 [38]
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3 years ago
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