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butalik [34]
3 years ago
7

What role do white blood cells perform in a human body?

Biology
2 answers:
Talja [164]3 years ago
4 0

Answer:

a. protect against pathogens

Explanation:

on edge

Montano1993 [528]3 years ago
3 0
White blood cells protect you against illness and disease. so Protect against pathogens
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2 years ago
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Mashutka [201]

Answer: Classified as a theory.

Explanation: The dictionary definition of theory is a system of ideas that are used to logically explain something. It also says that they are also based off of something not entirely connected to the thing the theory is being made about.

Because the idea that the universe has expanded explains such a large number of observations, which in turn leads to more predictions and therefore more observations that support it, this becomes your system of ideas. Because this system was based off of the aforementioned observations in the first paragraph, this proves that it is best classified as a theory.

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3 years ago
Cells must be alive to use energy and do work dose passive transport occur in a cell that is dead? Why or why not?
Orlov [11]

Answer:

<h3>Yes, Passive transport can occur in dead cells.</h3>

Explanation:

For passive transport to occur, a concentration gradient has to be formed across a permeable or semi-permeable membrane. If the cell membrane of the dead cell, which is a semipermeable membrane, is intact and a concentration gradient has formed on both sides, passive transport can occur.

A concentration gradient is the difference in the concentration of solute molecules  across the membrane. Passive transport will allow solute molecules to travel from the higher concentration of the solute to the lower concentration across a membrane till equilibrium is reached, that is, both the sides of the membrane has equal concentration of the solute.

The transport of the solvent can occur as well, from higher concentration to lower concentration.  

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3 years ago
Which of the following statements about hemoglobin is TRUE?
Alinara [238K]

E




Hope I helped thanksss

8 0
3 years ago
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The theory of evolution is controversial among some people, but not among scientists. Lots and lots of evidence support this the
jasenka [17]

Answer: A

Explanation:

"That's what evolution is all about: tiny changes in organisms of a species over a huge amount of time."

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2 years ago
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