1. The conglomerate has disappeared! What can turn pebbles and sand (sediment) into a conglomerate

In the Miller-Urey experiment, electrical sparks were passed through a mixture of gases, including hydrogen, water vapor, methan

STatiana [176]

Answer:

The answer is B. Some organic molecules, including amino acids, could have been produced from chemical reactions on early Earth.

Explanation:

Miller-Urey Experiment:

The Miller-Urey experiment was an attempt to explain the origin of life on Earth. Miller-Urey simulated the primordial soup i.e. the environment of primitive Earth to prove the spontaneous generation of organic molecules. The conditions they introduced included:

A methane-ammonia-hydrogen and water mixture that exactly simulated the primordial soup.
A spark of 70,000 volts that simulated lightening.
A temperature of 800 degree Celsius.

Observations:

After running for 18 days, the final solution was examined for presence of organic molecules.
Miller-Urey observed that most of the methane and ammonia had been consumed and the mixture contained carbon monoxide and nitrogen.
The solution further contained 25 amino acids (mainly, glycine, alanine and aspartic acid) , several fatty acids , hydroxy acids and amide products.

The experiment concluded that simple organic compounds such as amino acids could have been formed through spontaneous generation under the Earth's primitive environmental conditions.

5 0

2 years ago

Which of the following blood type genotypes result in the same phenotype? a) I^A I^A and I^A I^B b) I^B I^B and I^B i c) I^B I^B

Lady bird [3.3K]

The letter I is just there. Blood type problems will usually have

$I^{A}I^{A}$ and $I^{A}i$ = blood type A
$I^{B}I^{B}$ and $I^{B}i$ = blood type B
$I^{A}I^{B}$ would be blood type AB
<span> $ii$ would be blood type O.
</span>
So the answer would be B since B is the only option that the offspring would be only blood type B, which is the same as their parents.

8 0

2 years ago

Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg • m/s. The bike hits a rock, which stops it complet

mina [271]

Answer:

5.7 m/s

Explanation:

The computation of Sheila 's velocity right after she gets thrown out of the bike is shown below:

1) The Physical principle: conservation of momentum.

If there is no net external force operating on a system, so the system's total momentum is conserved

The momentum, p, is a vector magnitude that is determined as the product of the mass by the velocity:

P = mv.

2) Taking into account therefore that there is no net force on the device, Sheila and the momentum of the bike are the identical pre and post collision.

Based on this, the calculation is as follows

Momentum before the collision:

$P_1 = (mass\ of\ Sheila + mass\ of\ the\ bike) \times velocity$