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adoni [48]
2 years ago
6

What evidence exists that humans evolved in africa?

Biology
1 answer:
garri49 [273]2 years ago
4 0

Fossil record of the first possible bipeds is the evidence exists that state humans are evolved in Africa. Modern humans arose in Africa at least 250,000 to 300,000 years ago, fossils and DNA are the evidence that  reveals. Scientists have been unable to pinpoint a more specific homeland because the earliest Homo sapiens fossils are found all across Africa.

Humans first evolved in Africa, and much of human evolution occurred on that continent. The fossils of early humans who lived between 6 and 2 million years ago come entirely from Africa. Most scientists currently recognize some 15 to 20 different species of early humans found from Africa.

To learn more about Africa , here

brainly.com/question/1959687

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Why are most systems in the human body negative feedback systems?A. Negative feedback systems allow humans to regulate and stabi
Tatiana [17]

Negative feedback systems are responses in your body that happen in order to maintain homeostasis and balance within a system. One example of negative feedback system is thermoregulation. If we did`nt have that, the temperature of our organisms would change drastically and it could cause bad consequences for our health and body functioning. The correct answer is letter A: Negative feedback systems allow humans to regulate ans stabilize their systems.

7 0
1 year ago
What are the two most essential components of any medium, regardless
vodka [1.7K]

Answer:

Sugar and nutrients.

Explanation:

Culture media are chemical compositions created in the laboratory that provide all the necessary resources for the creation of microorganisms in vitro. In short, the culture media provide adequate food for microorganisms to grow and be analyzed and studied.

The culture media can have a liquid, solid or semi-solid consistency, however it is important that regardless of cosistence, they all have in their composition sugars (which will provide carbon and energy for the microorganism) and nutrient (so that they grow nourished and strong).

4 0
4 years ago
Suppose some female rats are given caffeine and others are not. the researchers then count how many times the rats given caffein
s344n2d4d5 [400]
The independent variable is that in which the result is dependent on. For experiments, this is usually the item being varied. For this case, what is being varied is that one group is given caffeine while the other is not. That makes the amount of caffeine given to be our independent variable. 
8 0
3 years ago
A diploid (2n) cell divides by meiosis, producing four daughter cells. Next, each daughter cell divides by mitosis, producing a
Debora [2.8K]

Answer:

Each granddaughter cell is haploid (n)

Explanation:

Meiosis in the parent cell with a "2n" chromosome number would produce a total of four daughter cells. Each of these daughter cells would have an "n" number of chromosomes as separation of homologous chromosomes to the opposite poles during anaphase-I reduces the chromosome number to half in the daughter cells. Also, the event of crossing over and random segregation of homologous chromosomes makes the daughter cells of meiosis genetically different from each other.

Each of these four cells enters mitosis and forms a total of eight cells. Since mitosis maintains the chromosome number, each of the eight cells would have an "n" number of chromosomes and would be haploid.

8 0
4 years ago
Consider the scenarios described below. Match the concept described by the scenario with the theory.
astraxan [27]

Answer:

1 - natural selection

2 - uniformitarianism

3- inheritance of acquired characteristics

4 - catastrophism

Explanation:

1. Natural selection refers to the evolution of organism or changes in the characterstics of organism depending on the environmental conditions. Hence, the lizard moved on fantasy island evolved with larger head and stronger bites as per the environmental condition.

2. The concept of Uniformitarianism states that the natural geological processes happening in present have already occured in past with same intesity and rate. Hence, geologist uses the phrase "The present is the key to the past" for  formation of mountain, rock formation and water movements.

3. Inheritance of acquired characteristics are the characteristic acquird by the ancestors and transmitted that gradually acquired characteristic to their progeny. Hence, the rats acquire the charactieristics and transfered it to the next generations.

4. Catastrophism means the regular occurrence of meteorological and geological disturbances to explain the existence the fossil record. Hence, teh mass exticiton due to asteroid impact is an example of Catastrophism.

So, the correct options in sequential order is natural selection, uniformitarianism, inheritance of acquired characteristics, and catastrophism.

3 0
4 years ago
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