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umka2103 [35]
3 years ago
15

How did black bears become so diverse over time?

Biology
1 answer:
serious [3.7K]3 years ago
8 0

Answer: They evolved from the same line as the cave bear, descending from Ursus abstrusus, a small, primitive black bear. Ursus Euarctos, a black bear, came to North America during the Pliocene Epoch before the brown bear.

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Why are protozoa significant? Select all that apply. Protozoa contaminate the water supply. Protozoa do not contribute to a food
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Answer: Protozoa contaminate the water supply.

Some protozoa are parasites and cause diseases like malaria.

Protozoa have an important role in the food chain.

Protozoa are parasitic or free living single celled eukaryotic organisms. They are mostly found in water bodies.

Protozoa contaminate the water supply: Some of the protozoan species which are released from the human feces usually contaminate thee water, and causes waterborne infections in humans. Examples are Cryptosporium and Giardia. The infection occurs through drinking water or swallowing water from swimming pool.

Some protozoa are parasites and cause diseases like malaria: The Plasmodium is the genus belonging to the protozoan parasites. This malarial parasite is transmitted by female Anopheles mosquitoes to humans. The parasite multiply in the red blood cells causes symptoms like fever, anemia, flue, illness and may also cause coma and death.

Protozoa have an important role in the food chain: The protozoa species plays many roles in the food chain, they act as consumers, predators or prey, herbivores and decomposers. Their main function is to control the population of other species in the same habitat. They engulf small single celled bacteria, hence prevents excessive bacterial colonization act as predator. They also feed upon the algal species therefore, act as herbivores. They act as decomposers, as they feed upon the organic matter present in the bottom of the aquatic water body. They are the source of food for large worm and insect species.


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Why is it important to participate in global economy
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Answer:

It's important to participate in the global economy because there are many benefits to it such as free trade, increased investment, and increased economies of scale. The developments occurring throughout our global economy are crucial because it has allowed for working with other countries to make the most of the good and services, and in turn allowing a strong economy to be formed.

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Sister chromosome exchanges are recombination events that occur between homologous chromosomes and are often the result of:
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Sister chromosome exchanges are recombination events that occur between homologous chromosomes and are often the result of exposure of the cell to DNA damaging agents. 
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What gender would most likely get wolf hirshhorn syndrome and why
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The prevalence of WHS  Wolf–Hirschhorn syndrome is more common in females than in males, with a male-to-female ratio of 1:2 reason being for a dysmorphic features and cytogenetic abnormalities

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