1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
SVEN [57.7K]
2 years ago
11

Which of the following is NOT an unresolved question about the origins of early life? a. Whether the early atmosphere was methan

e rich b. Whether early cells formed in hot or cold environments c. Whether early cells had a membrane surrounding them d. Whether the first life was extraterrestrial
Biology
1 answer:
GaryK [48]2 years ago
6 0

The answer here is D, and it's kind of obvious. But you probably already knew the answer and are just doing this for piece of mind.

Explanation: Just the fact that we don't know whether or not there even is extraterrestrial life rules out every other answer, without even needing to go in depth.

(Okay, I read your question completely wrong, it's asking for which one of these has been solved isn't it?)

This is tough because all of these other than D have been figured out. Go with the methane atmosphere then.

You might be interested in
How many times does the moon orbit earth in one year
SVETLANKA909090 [29]

Hello.

The Moon makes a full orbit around the Earth approximately once every 28 days. This means that the Moon orbits the Earth around 13 times in a year.

Hope this helps! Have an amazing rest of your day

6 0
3 years ago
Nepal is rich in medicinal plants ​
Akimi4 [234]

Answer: well yes but actually yes

Explanation:

6 0
2 years ago
Read 2 more answers
Evolution should not be equated with progress. Explain
Papessa [141]

A species could gain negative traits through evolution. So, evolution does not always mean progress.

4 0
2 years ago
The D string on a violin has a frequency of 293 Hz when it is in tune. Ca<br> lculate the period
masya89 [10]

The period of the D string on the violin would be 0.0034 seconds.

<h3>What is the period of a wave?</h3>

The period of a generated wave is the time it takes for the wave's wavelength or successive crests or troughs to pass through a specific point. In other words, it is the time required to complete a full cycle of oscillation.

Mathematically, the period of a wave is given by:

Period = 1/f

where f is the frequency of the wave.

In the case of the D string of the violin in the illustrated problem, the frequency of the wave is given as 293 Hz when it is in tune. Thus, the period can be calculated as:

Period  = 1/293

            =  0.0034 seconds

Thus, the period of oscillation of wave generated by the D string on the violin with a frequency of 293 Hz is 0.0034 seconds.

More on the period of waves can be found here: brainly.com/question/14588679

#SPJ1

6 0
11 months ago
Nuclei with an _____________ number of protons and neutrons possess a property called spin. Nuclear spin can be thought as eithe
andriy [413]

Answer:

Explanation:

\text{We are to fill in the blanks with the correct words that best suit the blanks}

\text{Nuclei with an} \ \mathbf{odd}  \  \text{number of protons and neutrons possess a property }

\text{called spin. Nuclear spin can be thought as either up or down with the spin }

\mathbf{magnetic \  field.}

\text{When a molecule is placed in an NMR, a large}  \ \mathbf{magnetic}  \ \text{field is applied making the }\text{spin states become of unequal energy, with the spin that generates a magnetic field  }\text{in the same direction of the applied magnetic field being}\ \mathbf{ lower} \ \text{ in energy. The NMR }\text{then uses} \ \mathbf{ radio \ frequency}\ \text{ to 'flip the spin' of each nuclei, wherein each nuclei will }\text{require a specific energy level of radiation that corresponds to its difference in  }\text{energy of spin states, this is often called the nuclei's}\  \ \mathbf{resonance } \  \text{frequency, } \text{which is measured by the NMR and translated to teh final spectra.}

7 0
2 years ago
Other questions:
  • Who is responsible for bring the Aztec Empire to an end?
    9·1 answer
  • A main symptom in lewy body disease is loss of _____.
    7·1 answer
  • Why is tomato and avocado classified as a fruit?
    15·1 answer
  • There are six people in the Fisher family. Olivia and Marcus are the parents. They have four children: Violet, Nathan, Jonas, an
    10·2 answers
  • Do male or female songbirds build the nest? please show source and evidence to support your answer
    13·1 answer
  • Which statement is true about the scientific method? It follows one prescribed sequence of steps. It begins and ends with an exp
    13·1 answer
  • you cannot blank or blank a pure substance by physical changes. it must go through a blank change in order to break down into di
    6·1 answer
  • When these clouds break apart, they let out buckets of rain or snow
    12·2 answers
  • What is the primary difference between diffusion and osmosis
    13·1 answer
  • Which of the following is not a product or use of tropical rainforests?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!