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o-na [289]
4 years ago
9

When did Barack Obama became a president

Biology
2 answers:
Oxana [17]4 years ago
4 0
Barack Obama was elected president in November of 2008. He was sworn in January 20, 2009.
aivan3 [116]4 years ago
4 0

The two candidates engaged in three presidential debates in September and October 2008. On November 4, Obama won the presidency with 365 electoral votes to 173 received by McCain. Obama won 52.9% of the popular vote to McCain's 45.7%. He became the first African American to be elected president.


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How did early humans survive without clothes?
blsea [12.9K]
Of course we can survive without clothes. We evolved a hairless body because our ancestor was an ape that was forced to live in the hot, open savanna, where fur is not needed. In fact, many people around the world did not wear any clothes. Native Hawaiians, for example, wore no clothes when the first European explorers arrived. Amazonians and Africans also did not wear clothes. Humans evolved in Africa about 150,000 years ago, and the early humans wore no clothes. Humans started migrating out of Africa about 60,000 to 70,000 years ago. They followed the coast line and went all the way to Australia. These early migrants ended up in places that required no clothes. Only when humans migrated to places like ice age Europe and northern parts of Asia (northern parts of China, Japan and Korea) did they need to wear clothes or animal skins to stay warm. Wearing clothes blocks out the sun and these people were in danger of vitamin D deficiency, which leads to rickets. Rickets can result in muscle cramps, broken or deformed bones and even death. In order to absorb enough UV light to synthesize vitamin D, there was strong selection pressure to evolve lighter skin tones.

The habit of wearing clothes, even in places that do not require them, was spread by European Christians. Basically they forced and/or shamed the natives to wear clothes wherever they went.Of course, not wearing clothes means that humans will no longer be able to live in temperate areas around the world, at least not during the fall and winter months.
3 0
3 years ago
Biological twins look alike because of what ​
ICE Princess25 [194]

Answer:

Genes

Explanation:

7 0
3 years ago
Several children seen at a local pediatric clinic are found to have a hemoglobin level of 10-11 g/dl (100-110 g/l). which dietar
Lemur [1.5K]
Answer;
-Ensuring adequate intake of meat, fish, poultry, and legumes 
The dietary modification that is most likely to help increase hemoglobin levels in these clients is by ensuring adequate intake of meat, fish, poultry, and legumes.

Explanation; 
Hemoglobin is the oxygen carrying pigment in the red blood cells. <span>The normal ranges for hemoglobin depend on the age and, beginning in adolescence, the sex of the person. For example in children the Normal range is 11-13 gm/dl. </span>Pediatric<span> anemia may occur when the </span>hemoglobin<span> or hematocrit </span>level<span> lower than the age-</span><span>adjusted reference range for healthy </span>children. 
7 0
3 years ago
Beneficial micro-organisms that are responsible for breaking down organic matter are called?.
Lina20 [59]
Decomposers break down organic matter.
Some examples are fungi,bacteria and protozoa.
7 0
2 years ago
Select the correct answer. Which statement about natural selection is true? A. Natural selection and evolution are two terms for
Masja [62]

Answer:

C. Natural selection is the process by which organisms with more beneficial traits are more likely to survive and reproduce.

Explanation:

Natural selection is an evolutional process by which species of living organisms with stronger or more beneficial traits have higher chances of survival and reproduction. In other words, it is the process by which organisms adapt and survive.

Organisms in a population are all different in their own ways. And those with characteristics or traits better suited for the environment are more likely to survive than those without. The selection prefers more beneficial traits and not wholly on the superiority of the organism. So, the survival and reproduction chance of an organism depends on the presence of traits beneficial to the environment, which is how nature selects. And in this process, those selected will dominate the population while those rejected will be reduced or even die.

Thus, the correct answer is option C.

6 0
3 years ago
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