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velikii [3]
3 years ago
5

Is sharpening a pencil a physical or chemical change?

Biology
2 answers:
kati45 [8]3 years ago
7 0
It is a physical change because it doesn't not change what the pencil is made of, it only changes the appearance, which is the complete opposite of a chemical change.
Hunter-Best [27]3 years ago
5 0
This one can be tricky, because your are changing the appearance of the substance. But here, you aren't changing its chemical form, so its a physical change. Even though you can't bring the pencil to its original beginning, its still a physical change. 

Answer: Physical change. 
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A classification of metamorphic rocks would include whether they are ____.
Luden [163]

Answer:

C. Foliated or nonfoliated

Explanation:

8 0
3 years ago
Glia that provide myelin for neurons in the brain are called ________.
kati45 [8]

Answer:

oligodendrocytes

Explanation:

Glial cells are part of the nervous system. These are helper cells that support the function of the central nervous system (CNS) and can be called oligodendrocytes when they supply myelin to neurons.  These cells are responsible for producing the myelin sheath have the function of electrical insulator for CNS neurons. They have extensions that wrap around the axons, producing the myelin sheath.

It is estimated that there are 10 glia cells in the CNS for each neuron, but because of their small size, they occupy half the volume of nervous tissue. They differ in form and function and they are: oligodendrocytes, astrocytes, Schwann cells, ependymal cells, and microglia.

4 0
3 years ago
What prevents the lac genes in the DNA of E. colin from being expressed most of the time ?
Alona [7]
The lac repressor prevents the lac genes in the DNA of E. coli from being expressed most of the time. The answer to your question is A. I hope this is the answer that you are looking for and it comes to your help.
3 0
3 years ago
Biodiversity is the existence of many different kinds of plants and animals in an environment. Describe why the tropical rainfor
inysia [295]

Answer:

Biodiversity: Tropical rainforests are areas of extremely high biodiversity compared to other ecosystems. Biologists estimate that tropical rainforests contain about 50% of the world's terrestrial plant and animal species, yet they encompass only about 6% of the world's land area.

Explanation:

7 0
2 years ago
how do mosses, ferns, gymnosperms, and angiosperms reproduce? general ideas with similarities and differences is what we’re look
lord [1]

Answer:

angiosperms and gymnosperms away from water, mosses and ferns with water

Explanation:

Pollen allows angiosperms and gymnosperms to reproduce away from water, unlike mosses and ferns which require water for sperm to swim to the female gametophyte.

4 0
3 years ago
Read 2 more answers
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