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3 years ago

Which is a closed system.a tree, a human ,a clock , or a car

1 answer:

4 0

A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)

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storchak [24]

Fish,hawk,sparrow and heron

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2 years ago

What type of farming uses monocultures of trees or shrubs? les

Vitek1552 [10]

Answer:

commercial plantation

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2 years ago

Spiders use their silk to build strong webs, to trap bugs, to save themselves from falling, to wrap their eggs safely, and even

11Alexandr11 [23.1K]

Answer:

The missing word is things.

However, the real question is how one material can serve so many purposes? That is what makes it possible for the spiders web to have a high "utility" value?

The answer is in how the spiders make the silk.

Explanation:

So it interesting to note that spiders do not make only one kind of silk. They vary depending on what purpose it's doing serve.

The most common type is Dragline Silk.

Dragline Silk: This contains spidroins. Spidroins fall under a category of a protein called scleroproteins. Because of its composition, a strand or fiber of Dragline has the same tensile strength as steel albeit more flexible. That is if one produced steel the diameter of a spider's silk, and compared both for strength, the silk will be stronger.

The spider produces Dragline silk in its silk glands where they are as viscous as a paste. From here is pulled out or extruded into lines of silk.

Other types of spider silk are:

Capture-spiral silk. Also known as the Flagelliform, they are used for securing lines of the web. They are adhesive, very elastic, and possess high tensile strength.
Tubiliform silk: They are also called Cylindriform. Its main use is for the protection of spider eggs. It is used to make a sac for which protects eggs. This type of silk is the toughest.
Aciniform silk: For preserving fresh prey.
Minor-ampullate silk: This type is used by spiders for creating temporary support while they are spinning a web. Etc.

Cheers

7 0

2 years ago

RNA and DNA are both nucleic acids, but differ in both structure and function. Which of the following is a correct way in which

Amanda [17]

Answer:

RNA is a single-stranded nucleic acid. RNA has a ribose sugar instead of a deoxyribose sugar like DNA. RNA nucleotides have a uracil base instead of thymine. There are many different types of DNA RNA is single stranded RNA forms a double helix.

Explanation:

5 0

2 years ago

Which environment is most likely to be characterized by dry scrub with frequent fires?

Katyanochek1 [597]

Environments likely to be characterized by the presence of dry scrubs and frequent wildfires are those that lack the presence of rain and suffer high sunlight hours.

When referring to the terrestrial biomes that meet the characteristics described, we can include:

Temperate grasslands
Cold deserts

The temperate grassland/cold desert biomes have:

cold and dry winters
hot, dry summers
Extended sunlight hours

This biome is very dry, and the harsh weather makes it difficult for plants to grow, leading to their dry scrub characteristic. This biome also experiences frequent wildfires due to the intense sunlight and lack of rain to which it is exposed.

To learn more visit:

brainly.com/question/11839824?referrer=searchResults

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2 years ago