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3 years ago

What is not characteristic of primitive mammals?

Biology

2 answers:

denis-greek [22]3 years ago

4 0

The correct answer is - B. feathered.

The primitive mammals were very small (with a couple of exceptions), rodent-like, also very often described as shrew-like. They were feeding with plants, as well as with insects and the occasional egg. Most of them were night creatures, and they were living in the shadow of the much bigger dinosaurs.

So, they were small, furry, rodent-like, night-dwellers, but there isn't a single evidence that any of the primitive mammals, or any mammal whatsoever, had feathers.

Mariulka [41]3 years ago

3 0

B. feathered

because mammals don't have feathers

HOPE THIS HELPS

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2 years ago

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There are 258 g of MgCl2/liter. What is the molarity of the solution?

Zolol [24]

Taking into account the definition of molarity, the molarity of the solution is 2.7098 moles of MgCl₂/liter.

<h3>Definition of molarity</h3>

Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles÷ volume

<h3>Molarity of the solution in this case</h3>

In this case, you know that the molar mass of MgCl₂ is 95.21 g/mole [molar mass is the amount of mass that a substance contains in one mole.]

You can apply the following rule of three: If by definition of molar mass 95.21 grams are contained in 1 mole, 258 grams are contained in how many moles?

amount of moles= (258 grams× 1 mole)÷ 95.21 grams

amount of moles= 2.7098 moles

Replacing in the definition of molarity:

258 g of MgCl₂/liter= 2.7098 moles of MgCl₂/liter

Finally, the molarity of the solution is 2.7098 moles of MgCl₂/liter.

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