The picture below shows the relationship between organisms that live in a valley. rats eaten by snakes
snakes eaten by eagles
Suppose the temperature of this ecosystem is unusually warm one year and the number of snakes greatly increases. What will most likely happen?
A.
The number of rats will increase.
B.
The number of rats will decrease.
C.
The number of eagles will stay the same.
D.
The number of eagles will decrease.

B

Explanation: Since there’s more snakes they’ll outweigh the rats and end up eating them until they’re gone unless the snake population decreases

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

read more on -

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)