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swat32
3 years ago
13

For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) last?

Biology
1 answer:
balandron [24]3 years ago
5 0
Hey You!

It lasts about 90 minutes for a normal person.
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What is the probability?:
Fittoniya [83]

Answer:

The probability that this couple will have a child with Duchenne Muscular Dystrophy is 50/50

Explanation:

This Punnett square shows our woman as "xx" and our man at "xy". Knowing this, we can now look back at the Punnett square's results. Out of the four squares, two of them are fill with the woman's carried condition, but the other two are also filled with the man's. So, that leaves us with a 50 percent chance that their child will have DMD.

Hope this helped!

Sources: N/A

6 0
3 years ago
What species of the genus homo was the first to have bigger brains and limb proportions similar to modern humans, to use fire, a
Ket [755]

The extinct ancient human Homo erectus is a species of firsts. It was the first of our relatives to have human-like body proportions, with shorter arms and longer legs relative to its torso.

<h3>What are Homo erectus?</h3>

Homo erectus, an extinct species of Pleistocene archaic human, first appeared about 2 million years ago. Several human species, including H. heidelbergensis and H. antecessor, seem to have diverged from H. erectus, with the former being largely accepted as the ancestor of Neanderthals, Denisovans, and modern humans. Among the first recognizable representatives of the genus Homo are its specimens. The first known ancestor of modern humans, H. erectus, had a continental range that stretched from the Iberian Peninsula to Java. H. floresiensis and possibly H. luzonensis may have its origins in Asian populations of Homo erectus. H. erectus soloensis, from Java, dates to a time period between 117,000 and 108,000 years ago.

To learn more about Homo erectus from the given link:

brainly.com/question/13542251

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8 0
2 years ago
What is Darwin’s theory of the origin of species?
Zielflug [23.3K]

Question:

<em>What is Darwin’s theory of the origin of species?</em>

Answer:

<em>The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.</em>

Hope this helps!

3 0
3 years ago
Explain the concept of “natural selection” and what it really means. Specifically what actually causes the natural selection and
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Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment and are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.

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4 0
2 years ago
In which of Earth's atmospheric layers does weather occur?
Allisa [31]
The answer is a. the troposphere
4 0
3 years ago
Read 2 more answers
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