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saveliy_v [14]
2 years ago
5

Which of the following conditions are required for natural selection?

Biology
2 answers:
Oksana_A [137]2 years ago
5 0

Answer:

I. overproduction of offspring

Explanation:

Overproduction of offspring is the idea that species produce far more offspring than an environment can support because most of the juveniles will not make it to adulthood. This allows only the fittest to survive and reproduce.

Temka [501]2 years ago
3 0

Answer:

overproduction and offspring& genetic variation

Explanation:

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

  1. 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.  
  2. 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.
  3. Aciniform silk: For preserving fresh prey.  
  4. 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
Three physical forces are involved in glomerular filtration: glomerular capillary blood pressure, plasma-colloid osmotic pressur
Elodia [21]

Answer: a. True

Explanation:

Glomerular filtrate is formed by the difference in force of hydrostatic and osmotic pressure. This physical force involves:

Bowman's capsule hydrostatic pressure: This includes the pressure that develops in the Bowman's capsule against the fluid to be filtrated expelled out by the glomerulus.

Glomerular hydrostatic pressure: The glomerulus is the main site of production of filtrate. It is higher than the average blood capillary hydrostatic pressure. It allows the water and solute molecules to be filtrated out of the plasma membrane.

Colloid osmotic pressure: The osmotic pressure which is generated by the large molecules is the colloid osmotic pressure. It is created by the plasma proteins. This pressure draws water from the glomerulus.

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A sentence correctly.<br> A cell maintains a biological balance known as
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Homeostasis it is an organism's ability to keep a constant internal environment.
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Do you think the practice of reusing materials is easy or difficult? Explain your thinking.
Mama L [17]

Answer:

difficult

Explanation:

I guessed because I'm smart

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What is a common goal of researchers who develop antibiotics and antiviral drugs?
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