Answer:
A
Explanation:
A) all cells contain DNA, and DNA is all composed of adenine, thymine, guanine, and cytosine.
B) not all cells have a nucleus. For example, prokaryotes have no nucleus
C)Not all cells have a cell wall.(Animal cells don't)
D) not all cells have mitochondria (Prokaryotes don't)
Answer:
Expansion and Contraction of underneath or base water
Explanation:
When ice lands on a road, it weakens the soil beneath the pavement, cement by expansion. The slight varying temperatures that leads to the combination of contraction and expansion affects road this leading to potholes on road.
Wind because you can always get wind energy
Answer:
Remove Na + from the extracellular compartment and assess the early current under new conditions
Explanation:
Na+ is a critical ion that influences the action potential in nerve cells. During the transmission of an impulse, the cell membrane is open so ions can flow through it, i.e., positively charged ions such as sodium ions (Na +) move within the cell, while negatively charged ions move outside the cell. This process produces a change in the action potential by rapidly increasing the positive charge in the nerve fiber, being thus the impulse propagated when this charge reaches +40 mv. In consequence, the effects of Na + on the single-channel current can be analyzed by removing positive ions and determining the change in the reversal potential of this channel.
