The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot. Water can pass through between the lipids.
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The biggest difference between the two is that the nervous system uses electrical impulses to send signals through neurons, whereas the hormonal system uses chemical messengers transported into blood plasma to target cells.
Transmission by the nervous system is short-lived but quick, whereas transmission by the hormonal system is long-lasting but takes much longer. Hene, communication is faster when using the nervous system.
In the nervous system, responses are localised - whereas in the hormonal system, they are widespread. Responses are often permanent in the hormonal system, but temporary and reversible in the nervous system.
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If these are your choices:
A. Warm water increases the speed of sound.
B. Cold water increases the speed of sound.
C. High water pressure decreases the speed of sound.
D. Low water pressure increases the speed of sound.
The answer is B. because warmer particles rises which is less dense than the cooler particles. Sound waves travels faster in a denser medium making statement B as the correct answer.
This map shows the precipitation pattern in different parts of Florida.
Certain crops require a specific amount of annual rainfall to be successful. Which statement explains why coconut palm trees are successful in Florida?
They need an annual rainfall of 8 to 16 inches.
They need an annual rainfall of 16 to 24 inches.
They need an annual rainfall of at least 30 to 50 inches.
They need an annual rainfall of at least 120 to 140 inches.1 Attachment<span> <span>art004.gif</span></span>
