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weqwewe [10]
3 years ago
14

What species first appeared to walk upright?

Social Studies
2 answers:
kkurt [141]3 years ago
7 0

Answer:

The first species that appeared to walk upright was the Australopithecus.

Explanation:

Australopithecus was an extinct genus of hominins that lived in Africa between 4.2 and 2 million years ago.

The Australopithecus presented both ancestral characters (little bulky brain) and derived characters (teeth close to that of the genus Homo). Their locomotion was generally mixed, and associated a form of bipedalism with an ability to climb still marked. It is possible that one of the Australopithecus species is at the origin of the genus Homo, which appeared in Africa between 3 and 2 million years ago.

blagie [28]3 years ago
3 0
I think <span>Australopithecines but not really sure. Hope it helps!</span>
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Jason made index cards on a textbook chapter and always studied them in the same order. During the exam, he was able to recall t
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Answer:a) Regency effec b) Primary effect

Explanation:The Primacy/Recency Effect refers to the fact that one is able to remember the first information or what they hear first or what they encounter at the begining (primacy ) and the last information at the end(Recency) better than they remember the information found in the middle .

Primacy is likely caused by the fact that one has plenty of time to recall this first presented Information because it doesn't compete with other information as it is the first encounter. Middle information is hard to recall because there is usually a lot of information to recall in the middle whilst the last information is usually short as does the first information.

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A committee consists of eight women and twelve men. Three committee members will be chosen as officers. What is the probability
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Answer:

The probability that all the officers are women is \frac{56}{1140}

Explanation:

Given a committee consisting of 8 women and 12 men, from which 3 committee members are to be chosen as officers from a committee.  

The total number of committee members is 8 + 12 = 20 members

C(n,r) = \frac{n!}{r!(n-r)!} which represents the number of combinations of taking r objects out of n.

The probability that all the officers are women = C(8,3) / C(20,3)

= \frac{8!}{3!(8-3)!} / \frac{20!}{3!(20-3)!}

=\frac{8!}{3!5!} /\frac{20!}{3!17!}

=\frac{56}{1140}

Therefore the probability that all the officers are women is \frac{56}{1140}

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