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Helen [10]
4 years ago
13

How do scientists know that humans originated in Africa?

Biology
1 answer:
exis [7]4 years ago
4 0
The oldest bones of human decent were found in Africa
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As described in "A Note About Bacterial Reproduction -- and the "Culture Bias,"" the organism Epulopiscium does not divide by bi
gayaneshka [121]

In liquid media or broth difference between dry and wet will give biomass of the Epulopiscium.

Explanation:

Biomass of bacteria can be measured by dry or wet mass. Bacteria numbers can be counted by spread plate method under the microscope.

In solid media the colonies obtained are diluted and number of cells will be seen by plate count method or on automated cell counter. The number would help calculate biomass

The biomass will be calculated by measuring wet and dry mass. Equipments required will be:

hydraulic gravity convection oven and centrifugation set up.

A cellulose acetate filter membrane is used which is 47 mm in diameter and 0.45 micron of pore size.

The cells  grown settles down due to gravity. They are stirred to evenly spread in the broth and is kept in centrifuge.

The cells obtained after centrifugation will be taken and wet weight is obtained.

To obtain dry weight the cells are placed in oven for 6 hours to 24 hours. The resultant cells are weighed and dry weight obtained.

Biomass will be calculated by subtracting the wet mass to dry mass. This way biomass is obtained in epulopisicuium. Here the cells will be of different size so on centrifugation 2 or more phases of cells can be seen due to gravity change.

8 0
3 years ago
NEED HELP! describe how turning off the eletric currrent in an industrial electromagnet affects its magnetic field.
yan [13]

Answer:

It disappears, there will be no more magnetic field when the eclectic current stops.

3 0
3 years ago
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How can yeast cells be genetically modified to produce pyrethrin?
HACTEHA [7]

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Yeast cells genetically modified to create morphine-like painkiller. To make a batch of the drugs can take a year. The traditional method is unreliable as well as time-consuming, as the plants can be damaged by bad weather, pests and disease.

Explanation:

5 0
3 years ago
Organisms and their nonliving environment are connected.<br><br> True<br> False
Helga [31]
True
Organisms depend on many nonliving things in their environment, such as air, food, water, etc. If something were to happen to an organism's nonliving environment (ie a drought, fire, water contamination), the organisms would be severely affected.
8 0
4 years ago
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Structures represented in the illustration below are found in the lower epidermis of a plant leaf. The illustration shows the re
aleksandr82 [10.1K]

Answer: I think it's the third one: Letter Q points to the guard cell. Letter T points to the stomata and the response is most likely due to the humid tropical nature of the enviorment.

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3 years ago
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