The atria of the heart merely need to allow blood to flow into the ventricle, and therefore aren't very muscular.
The ventricles of the heart need to actually pump blood to the rest of the body, whether to the lungs or the the rest of the body.
Answer:
These are the following answers to the items:
Pinocytosis -cell engulfs molecules in cell "drinking"
Facilitated diffusion- molecules helped by protein; move insoluble molecules
across plasma membrane
Passive diffusion- molecules move in and out freely from high to low concentration
Phagocytosis- cell engulfs microorganisms in cell "eating"
Active transport- molecules "pumped" in or out from low to high concentration
Passive diffusion- oxygen, carbon dioxide
Active transport- transports sodium, potassium
Pinocytosis- transports glucose, amino acids
Explanation:
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<span>Asexual
reproduction produces offspring that are genetically identical to a single
parent. The offspring may either bud from the parent or by fission. An example
of this is Baker’s yeast. They are produced by budding. So as the small bud
grows from the parent, it receives the same nucleus of the parent. When it
pinches off from the parent, it is smaller but is genetically similar to the
parent. On the other hand sexual reproduction involves two parents that contribute
to the genetic material in order to produce a unique offspring. Your answer is
incorrect. The correct answer is letter B.</span>
Answer:
years
Explanation:
Given-
Half life of 
C 
years
As we know -
Where
Mass of radioactive carbon after a time period "t"
initial mass of radioactive carbon
radioactive decay constant
time
First we will find the value of "k"
On solving, we get -
Now, when mass of 14C becomes 
% of the plant material on earth today, then its age would be
years
