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ivanzaharov [21]
3 years ago
7

What are the two methods used together to demonstrate the Earth is at least 3.8 billion years old? List and briefly describe the

methods.
Biology
1 answer:
Veronika [31]3 years ago
6 0

Answer:

Likewise, scientists use radiometric dating to determine the ages of moon rocks, obtained by astronauts. Taken together, these methods give results that suggest an age for our Earth, meteorites, the moon – and by inference our entire solar system – of 4.5 to 4.6 billion years old.

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When is a sea breeze most intense
stealth61 [152]
A sea breeze is most intense during mid to late afternoon 
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3 years ago
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Refer the the graph below showing the absorption spectrum of chlorophyll a. Explain what the graph is showing
Stella [2.4K]

Answer: The graph shows that chlorophyll a absorbs light principally around 420-450 nm and 650-680nm wavelengths

Explanation: Chlorophyll a is a pigment found in plants that traps light energy for use in photosynthesis. Chlorophyll a absorbs light mostly in the blue and orange-red wavelengths. This is shown in the graph, where the peaks are around the 400nm and 600nm wavelengths, corresponding to blue and red in visible light.

This absorption means the pigment is 'excited' by this light, sending into a higher state if energy which provides energy for the reactions of photosynthesis.

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2 years ago
For larger distances such as the distance between objects in the far reaches of our galaxy astronomers ensure in units of?
Scorpion4ik [409]

Answer:

Lightyears

Explanation:

When dealing with very large interstellar distances, astronomers do not use the regular miles, kilometers, or meters we are used to. This is because they are just too small to be used as a metric when measuring such large distances. As a matter of fact, the earthly number system will quickly be exhausted when trying to measure some of these interstellar distances.

Instead, astronomers make use of Lightyears. Lightyears are defined by the distance traveled by an object moving at the speed of light if it was moving constantly at that speed for one year.

This can properly be used to estimate interstellar distances. since its value is very large. 1 lightyear = 9,461,000,000,000 Km

If we say that our closest star is 9 lightyears away, we are saying that it will take an object moving at the speed of light 9 years to travel from that star to our planet.

7 0
2 years ago
give two reasons why it is better fro human muscle cells to produce energy through aerobic respiration than through anaerobic re
astra-53 [7]

Answer:

During anaerobic respiration lactic acid is produced which is not good for human. It causes muscle pain.

ATP produces during anaerobic respiration are less while aerobic respiration produces more ATPs.

Explanation:

During anaerobic respiration lactic acid is produced which is not good for human. It causes muscle pain.

ATP produces during anaerobic respiration are less while aerobic respiration produces more ATPs.

Aerobic respiration

It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.

Glucose + oxygen → carbon dioxide + water + 38ATP

Anaerobic Respiration

It is the breakdown of glucose molecule in the absence of oxygen and produce small amount of energy. Alcohol or lactic acid and carbon dioxide are also produced as byproducts.  

Glucose→ lactic acid/alcohol + 2ATP + carbon dioxide

7 0
3 years ago
Choose 5 different organisms. At least one of your organisms needs to be a plant. List an adaptation and describe how the adapta
spayn [35]

Answer:

1) wood frog - freezes their body in winter

To survive the winter Wood Frogs' bodies freeze solid. They also stop breathing and their heart stops beating. This allows them to survive temperatures as low as -80 degrees Fahrenheit. And in spring, they thaw out and "come back to life.

2) Kangaroo rats survive without ever drinking water.

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3) Chameleon - blend in with the environment by changing its color to escape from predators

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5)Venus fly trap plant that is adapted for living in soil that doesn't provide enough nutrients.

6)  the seaweed is a plant adapted for its underwater environment

6 0
3 years ago
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