<h3><u>Answer;</u></h3>
A. global temperatures drop several degrees after several massive volcanic eruptions
<h3><u>Explanation;</u></h3>
- <em><u>A mass extinction refers to a widespread and a rapid decrease in the Earth's biodiversity. </u></em>
- <em><u>Mass extinctions may occur due to a number of reasons which includes, asteroid impacts, climate change, massive volcanic eruptions or a combination of all these causes. </u></em>
- <em><u>An example of mass extinction was during the Mesozoic Era, that led to the extinction of dinosaurs, about 65 million years ago.</u></em>
In the GPCR-adenylyl cyclase signal transduction system, which step initiates amplification?
In the GPCR-adenylyl cyclase signal transduction system, which step initiates amplification?
Protein kinase A activation
The cellular response
Activation of the G protein
Production of cAMP
Production of cAMP
Hope this help
We have that for the Question "Label electron micrograph of B <em>lymphocyte</em>. " it can be said that
The correct <em>labelling </em>of the B lymphocyte. or B cell is
- A)Lymphocyte
- B)Microrilli
- C)Heterochromatin
- D)Nucleus
- E)Nucleolus
From the question we are told
Label electron micrograph of B <em>lymphocyte</em>.
<h3>
Micrograph of B lymphocyte.</h3>
Generally
B lymphocyte aka B Cell are specific set of white blood cell that hail from the lymphocyte subtype.
They also in there various functions present antigens and secrete cytokines.
Therefore
The correct labelling of the B lymphocyte. or B cell is
- A)Lymphocyte
- B)Microrilli
- C)Heterochromatin
- D)Nucleus
- E)Nucleolus
For more information on Micrograph visit
brainly.com/question/19157359
gneiss is formed at the highest temperatures and pressures
