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daser333 [38]
3 years ago
15

David Fee studies sound waves so deep and low that humans cannot hear them. What are these low frequencies

Biology
2 answers:
Mashutka [201]3 years ago
6 0
Infasound ✅ it’s under 20Hz but many animals can hear this sound. Humans cannot
timofeeve [1]3 years ago
5 0

Answer: infrasound

Explanation:

The infrasound is called as the low frequency sound. The frequency of these sounds is less than 20 Hz. The sound waves of the infrasound cannot be perceived by the humans as human ear are less sensitive to the low frequency. The infrasound can be produced in extreme weather conditions, earthquakes, meteor impacts, explosive detonation, collision of oceanic waves, waves on beach, and sound produced by the air conditioner.

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In the mid ____________ , ____________ was the first surgeon to introduce aseptic techniques into the operating room in an effor
svp [43]

alantic and Semmelweis was the first

5 0
2 years ago
Match the name of the greenhouse gas with one of the human activities that produces it.
Svet_ta [14]

Answer:

carbon dioxide- burning of fossil fuels

fluorinated gases- industrial processes

methane- production and transport of oil and natural

gas

nitrous oxide- agricultural and industrial activities

Explanation:

Greenhouse gases are gaseous components that induces greenhouse effect. This means that due to their structural ability to trap heat energy in the atmosphere, they contribute to the global warming effect on the Earth. However, this greenhouse gases are produced in large amounts as a result of the day-to-day anthropogenic activities. The following are the greenhouse gases and how they are produced.

Carbondioxide (CO2)- Carbondioxide is the most common and important greenhouse gas. It is generated via natural processes like respiration but also produced when fossil fuels e.g coal, petroleum etc. are burned.

Fluorinated gases- This is another greenhouse gas caused by activities of man. Fluorinated gases are produced in industries during the production of certain products.

Methane- Methane is a gaseous hydrocarbon and the principal constituent of natural gas. Therefore, the production and transportation of oil and natural gases can lead to the escape of methane into the atmosphere.

Nitrous oxide- Nitrous oxide is an oxide of nitrogen. It is mainly produced via agricultural processes such as nitrification and denitrification or use of fertilizers etc. and also industrial actions.

3 0
2 years ago
A sequence of who eats whom in an ecosystem ​
MrMuchimi

The answer is food chain.

5 0
3 years ago
Archaeologists unearthed a human skull with a small dried fragment of the scalp still attached. They extracted a tiny amount of
fomenos

Answer:

D. Use the polymerase chain reaction

Explanation:

Polymerase chain reaction (PCR) is a molecular technique used to make multiple copies or amplify  a particular DNA sample. This enables scientist conduct thorough genetic analysis on minute sample of DNA, simply by amplifying it to a large quantity.

The PCR machine is usually used to amplify DNA fragment. The DNA fragments undergo three major steps successively: denaturation, annealing and elongation

8 0
3 years ago
Which of the following are true about outgroups? a. They help identify plesiomorphic traits in the phylogeny b. They are a taxa
Tanzania [10]

Answer:

The the above statements are true about out groups.

Explanation:

a. Out groups called as the more related organism that determine the evolution of the in group traits.

Plesiomorphy means the ancestral character that determines the phylogenetic evolution of an individual.For example, presence of spinal column is a plesiomorphic character of mammals that are present in fish, amphibia,reptiles, birds etc.

b. In groups are diverge from the out group but the out groups are used as a point to compare with the in groups as it is essential to determine the evolution of a trait in a phylogeny.

c. Autapomorphic traits contain distinctive characters that is unique and found in a particular taxa but not found in a any other out group taxa.

d.Out groups are less evolved as they contain ancestral features and during evolution they are replaced by advance characters that are presently in in group traits.Out group study is required to study the evolutionary relationship of the in group trait.

5 0
2 years ago
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