It was believed that a asteroid hit the Earth (specifically Mexico) when the asteroid hit it caused a freezing darkness due to dust and debris being kicked up by the asteroid . The dust and debris blocked the sunlight causing a temperature drop.
Answer:
The first and last box. If you don't agree with the first then definitely consider the last box.
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, let's understand some terms
Activation energy is the minimum amount of energy required for a reaction to proceed. Under normal condition, when the activation energy is high, it takes longer for the reaction to proceed than when it is low.
The burning of marshmallow is an exothermic reaction as it involves the transfer of heat energy into the environment.
Answer:
The correct answer is option - only second and third scenarios are plausible.
Explanation:
A mutation that removes or eliminates the activity of the enzyme that is responsible or involved in synthesis of the porphyrin which cause pathogenic condition called anemia.
A mutation that allows that cause normal fetal hemoglobin to keep on producing into adulthood would enhances symptoms of sickle cell that is also a pathogenic condition.
Thus, the correct answer is option - only second and third scenarios are plausible.