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.
Insolation is the amount of solar energy that is incident on the surface of the earth. For the same insolation, water bodies tend to absorb the most heat as water has a high heat capacity and so do grasslands. Areas such as desserts and glaciers do not absorb high amounts of insolation due to which these areas exhibit extreme, inhabitable environments. The order becomes:
The Atlantic Ocean
A marshy wetland
Nevada desert
Polar ice caps
Answer:
The correct answer is "True".
Explanation:
The zebra mussel is a small animal that lives near freshwater zones, just like the ones present at the Hudson River of New York. In this place is where zebra mussel was first detected in May 1991. However, it had been traced that zebra mussel is originally native to the Black and Caspian Seas of Asia. It is believed that zebra mussel arrived to New York in the mid-1980s in the ballast water of ocean-going ships that came from Europe.
The alteration of serial numbers belong to the "Recovery of stolen electrical goods" phase.
NC, sterilization or removing a serial range is usually charged as a secondary offense aboard a thievery offense. Generally, a person who alters or removes a serial range is doing this to hide the actual fact that they either scarf the property or received transferred possession. As such, there's a public interest in toilsome people who have interaction during this activity.
The right option is; Hormones are the chemical signals, which are sent all through the body to monitor other processes of the body.
Hormones are chemical messengers that are secreted from the endocrine glands, and are released directly into the bloodstream, which transports them to tissues and organs to perform their functions. Different types of hormones act on different body function and processes. Hormones influence the body’s functions, including development and growth, cognitive function and mood, sexual function and reproduction, regulation of body temperature and thirst, and food metabolism.
