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Lady_Fox [76]
3 years ago
10

Which of the following cells is NOT an antigen presenting cell?

Biology
1 answer:
MakcuM [25]3 years ago
4 0

Answer:Dendritic cells Explanation:

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An important prelude to a greeting or opening line is often ______. small talk eye contact physical intimacy a pheromone
pychu [463]
<span>An important prelude to a greeting or opening line is often eye contact.</span>
6 0
3 years ago
While alive, an organism absorbs (radioactive) carbon 14 at such a rate that the proportion of carbon 14 in the organism remains
Inga [223]

Answer:

The person has been dead for approximately 15,300 years

Explanation:

<u>Available data</u>:

  • The half-life of carbon 14 is 5,600 years
  • The human skeleton level of carbon 14 is 15% that of a living human

To answer this question we can make use of the following equation

Ln (C14T₁/C14 T₀) = - λ T₁

Where,

  • C14 T₀ ⇒ Amount of carbon in a living body at time 0 = 100%
  • C14T₁ ⇒ Amount of carbon in the dead body at time 1 = 15%
  • λ ⇒ radioactive decay constant = (Ln2)/T₀,₅
  • T₀,₅ ⇒ The half-life of carbon 14 = 5600 years
  • T₀ = 0
  • T₁ = ???

Let us first calculate the radioactive decay constant.

λ = (Ln2)/T₀,₅

λ = 0.693/5600

λ = 0.000123

Now, let us calculate the first term in the equation

Ln (C14T₁/C14 T₀) = Ln (15%/100%) = Ln 0.15 = - 1.89

Finally, let us replace the terms, clear the equation, and calculate the value of T₁.

Ln (C14T₁/C14 T₀) = - λ T₁

- 1.89 = - 0.000123 x T₁

T₁ = - 1.89 / - 0.000123

T₁ = 15,365 years

The person has been dead for approximately 15,300 years

4 0
3 years ago
Hagfish are noted for having a skull, but no . . . A. pharyngeal slits.
Tpy6a [65]

Answer:

but no the answer is spine which can also be called vertebral column so is B

7 0
2 years ago
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What is special about human intelligence than animal intelligence?
Olegator [25]

Explanation:

The answer is monkey because monkey is a intelligent

5 0
2 years ago
What do you mean by Magniferra Indica ? ​
vfiekz [6]

Answer:

Mangifera indica, commonly known as mango, is a species of flowering plant in the family Anacardiaceae. It is a large fruit tree, capable of growing to a height of 30 metres (100 feet). There are two distinct genetic populations in modern mangoes – the "Indian type" and the "Southeast Asian type". Mangifera indica.

Its a type of mango i taste it it's pretty good

Explanation:

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