How do scientist determine when an era begins and when it ends?

1 answer:

7 0

The way that scientist determine when an era begins and when it ends is : Mass extinction of an organism
For example, millions years ago, the world was under the era of dinosaurs, which were simply the most superior beings on earth during that time, after they became extinct, the earth enter the era of the mammals

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HELP ASAP PLEASE

just olya [345]

I think option 4, to explain where black holes are located

3 0

3 years ago

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Select the four innovations that debuted in the 1990s. Wireless laptops web browsers 3-D TV cloud computing digital satellite TV

Art [367]

Answer:

Web Browsers,
Digital Satellite Television,
Streaming Audio and,
Text Messaging

Explanation:

The first web browser was launched in 1990 and was known as WorldWideWeb. To avoid confusion, it was later renamed the Nexus Browser. It was created by none other than the inventor of the World Wide Web, Sir Tim Berners-Lee.

The first Digital Satellite broadcasts were dated in 1994 in the United States.

The first known text message ever sent was in 1992 when a 22 year old man known as Neil Papworth used his personal computer to send the first characters ever to be sent by text messaging, "Merry Christmas". Mr. Papworth was an engineer working in the United Kingdom at the time.

Streaming Audio also debuted in the '90s although no definite date is given.

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3 years ago

foods such as rice and pasta, which are largely starch, need to be cooked in water before eating? why

tekilochka [14]

Answer:

Foods such as rice and pasta are dry by nature.So, you have to cook them with moisture to help them breakdown and become soft enough to be pleasant to eat.

Explanation:

5 0

2 years ago

How did rivers in new York help settlers?

Lelechka [254]

Beginning in the 1700s,settlers used waterways to travel the region. They also build towns along the waterways.

8 0

3 years ago

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A typical anti psychotics (also referred to as second-generation anti psychotics) affect _____ and dopamine.

Amanda [17]

Answer:

d) serotonin

Explanation:

Second-generation anti psychotics is based on blocking the dopamine receptor and the serotonin receptor. The common receptors blocked in this anti psychotics is the D2 dopamine receptor and the sub type 5-HT2A serotonin receptor. Hence, the answer to this is that the serotonin and dopamine receptors are affected by the second-generation anti psychotics also known as the typical anti psychotics.

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2 years ago