Answer:
A is the correct answer
Explanation:
the existed about 3.8to 4.0 billion years ago
Answer:
Risk behavior is the behavior of individual that may result in negative consequences, risks to life, death, injury, violation etc. It is important for teenagers as during this age of life teens may not have a correct perspective of future consequences of their deeds.
Explanation:
Two kinds of Fermentation are, Alcoholic and Lactic acid Fermentation.
Homeostasis is the equilibrium of a cell.
Autotrophs make their own food through photosynthesis.
Mitochondria undergoes cellular respiration and is often referred to as the "powerhouse of the cell".
The stronger survived and the weaker passed on... Those with a weaker immune system had trouble with sickness and usually ended up passing on but those with strong immune systems were stronger and healthier and lived.
