Scientists use many different methods of investigation. When possible, scientists want to actually experiment or observe an event. Which method is useful when developing ascientific reasoning for an event that cannot be studied directly?
Conduct a field survey of bird populations in an area
Observe the effect of various fertilizers on corn crop yields
Use a computer model to study how the ocean liner Titanic sank
Use a wind tunnel to measure air drag on various types or automobiles

Answers

Answer 1
Answer:

Answer:

Observe the effect of various fertilizers on corn crop yields

Explanation:

I think I'm right

Answer 2
Answer:

Answer:

Observe the effect of various fertilizers on corn crop yields

Explanation:


Related Questions

The amount of energy that is transferred at each level of the food chain is about _____. 1% 10% 50% 90%
Without this one characteristic, the species would become extinct
The cell has a cell wall and many organelles including mitochondria and nucleus a vacuole and several chloroplast
when light energy excites electrons in photosystem 2, where do the electrons to replace them come from
What is a chemical element?

Why are some samples stained before viewing them?

Answers

With DNA and small samples of organisms they are often transparent or very difficult to see. When you are viewing samples with a microscope the samples are so small that they are near about invisible to see as they are about half a micrometer thick or at times even smaller. The sample is placed in paraphin or epoxy, allowed to harden and then cut by a glass or crystal knife. The samples are then stained and placed under a microscope for viewing. The staining process can produce brilliant and beautiful designs from the crosssamples of these organisms.
Some samples are transparent, or very difficult to see, therefore, they are stained in order to be seen more clearly and easier to work with.

During eye surgery, the clear layer of the eye is stained to be easily extracted, if it was clear then the surgeon might cut the eye instead of just the layer.

Hope this helps, u might want to search online for more info.

Large-scale environmental catastrophes _______

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are mostly caused by the pollution due to man-made structures and factories. 
Large-scale environmental catastrophes are becoming norm in today's disastrous events which is an indicator that global warming is evident. Global warming is the rising of the global temperature due to the greenhouse effect mainly triggered by many exploitation to the environment. 

A _____ is a horizontal stem that can divide and grow in several directions at once. corm rhizome stolon bulb

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The correct answer is rhizome.

Rhizome is a modified horizontal underground stem. Rhizome may or may not be fleshy. It becomes fleshly when it stores food as in ginger. It looks like root but it is not root because there is presence of nodes, internodes, scale like leaves on it and it is frequently develops branches in different direction. Through rhizome many plants propagates vegetatively.    

Answer:

A rhizome is a horizontal stem that can divide and grow in several directions at once.

Which is part of the biosphere? A. humans B. stratosphere C. volcanoes D. oceans

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B is the correct answer.

The part of the biosphere is oceans.Its B.

How do pain relievers work?increase production of white blood cells
increase body temperature
block messages within the nervous system
block hormone production

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Answer:

The correct answer is option C, block messages within the nervous system

Explanation:

Whenever our body gets injured, the damaged cells in it releases a chemical known as “prostaglandin” which sends pain signals through the nerves to the brain. Now when a pain reliever is injected in the body, it stops the production of prostaglandin. As the chemical production stops, no pain messages are send to the brain and thus the pain goes away

I believe the answer is is that it blocks messages within the nervous system, because pain is perceived in the brain through messages sent from the nervous system.

This image was taken with a microscope that clearly shows the mitochondrion of a cell. Which of the following describes the types of microscope that was used.

Answers

Answer:

Explanation:

To determine the type of microscope used to capture the image of a cell's mitochondrion, you would typically need additional information, such as the features of the microscope and the microscopy technique employed. Microscopes commonly used to visualize cell structures include optical microscopes, electron microscopes, and fluorescence microscopes, each with its own capabilities and applications. If you have more details about the image or the microscope used, I'd be happy to provide further assistance.