D) to move molecules across the membrane against a gradient
Answer:
All cells undergo cellular respiration for the production of energy
Explanation:
The cell wall provides structure and support without it the cell would burst as the vacuole expands
Answer:
is used by commercial airplanes
Explanation:
The stratosphere is used by most commercial airplanes. This is because this layer of earth is stratified and more stable.
- The lowest level of the atmosphere is the troposphere.
- This layer is where all the bulk of the atmospheric gases are domiciled.
- Weather conditions occur here.
- This layer is not safe for flight due to its turbulent nature.
- The ionosphere is responsible for the transmission of radio signals around the earth.
- The earth's weather occurs in the region of the troposphere.
Answer:
Four
Explanation:
Like all proteins, the "blueprint" for hemoglobin exists in DNA.
