B. carbon and hydrogen
C. carbon and oxygen
D. carbon only
The answer would be A. Remember your organic compounds are carbohydrates, proteins, lipids and nucleic acids. All of these contain oxygen, carbon and hydrogen.
Carbohydrates- carbon, hydrogen, oxygen
Lipids- carbon, hydrogen, oxygen
Proteins- carbon, hydrogen, oxygen, nitrogen
Nucleic acids- carbon, hydrogen, oxygen, nitrogen, phosphorus
The type of DNA in each cell controls the rate of the cell cycle and the specific type of cells
formed
The size of the cell determines the number of cells that will be produced from each cycle.
Internal and external signals regulate the progression of the cell cycle at various critical
checkpoints
Hormones signal the start of the cell cycle, and DNA determines how the cell differentiates.
Answer:
The correct answer is internal and external signals regulate the progression of the cell cycle at various critical check points.
Explanation:
The cyclic event that helps to prepare the cell for division is termed as cell cycle.Cell cycle are regulated by various internal and external factors which regulates the passage of cell through various critical check point.
For example Maturation promoting factor helps in the progression of frog egg oocytes cells from G2 to M phase.
G1 cyclin CDK helps in the passage of cell from G1 to S phase.
The sun have magnetic pole reversal other than earth.
A shift in the magnetic field of the earth to the opposite polarity is known as a magnetic polarity reversal. Throughout the course of geologic time, this has happened sporadically.
The magnetic field decreases but does not vanish entirely after a pole reversal. Though there may be some particulate radiation that reaches Earth's surface, the magnetosphere and the atmosphere continue to shield the planet from cosmic rays and charged solar particles.
So, The correct option is D.
Learn more about relation between earth's mass and gravity here:
#SPJ2
Answer:
the sun
Explanation: