Passive is when the channels don't need energy to do so and active is when they need energy
the answer is 21<span>% oxygen, </span>
A, I believe. Because after collecting you need to analyze in order to do many other steps. Also all the other answers are something before collecting data
Contour intervals between contour lines
Answer:
C
Explanation:
the pressure on the inner core is greater than the pressure on the outer core and the melting point of iron, the main constituent of the core, increases as soon as the pressure goes up
