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Mandarinka [93]
3 years ago
7

Bird-hipped Ornithischian dinosaurs are the ancestors of modern day birds. a. True b. False

Biology
1 answer:
yulyashka [42]3 years ago
8 0

Answer:

False

Explanation:

It is found that birds have evolved in the Mesozoic Era from a a group of theropod dinosaurs. the most close relative of modern day bird was supposed to be a primitive bird known as Archaeopteryx. In a recent study  conducted by UCMP Berkeley, birds have common ancestors from the theropod lineage. More specifically, lizard-hipped dinosaurs are ancestors of birds.

Hence, the given statement is false

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A response that is uniquely directed against pathogenic bordetella pertussis would involve what component?
xxMikexx [17]

Answer:

Antibodies

Explanation:

Bordetella pertussis is an obligate human pathogen and is the etiological agent of whooping cough. It is known to be an opportunistic organism.

The pathogenic mechanism of Bordetella pertussis is also known as virulence factor. These virulence factors are known to include adhesins such as filamentous haemagglutinin, fimbriae and pertactin, which allow B. pertussis to bind to ciliated epithelial cells in the upper respiratory tract.

It is known to be the agent of whooping cough, a highly contagious respiratory disease, dramatic for infants and also for elderly and pregnant women.

In this case, the antibodies will be the response that is uniquely directed against the organism. It is said earlier that this organism is an opportunistic one, this means that it causes infection when the immunity is down. So, when the immunity is empowered , it will definitely fight against the organism

3 0
2 years ago
Based on the images taken through Stella’s microscope, which cell structures could be clearly identified using a compound micros
cestrela7 [59]

Answer:

Use 400 x in order to study the structure clearly.

Explanation:

Cell structures could be clearly identified when magnify the microscope about 400 x by using a compound microscope. Due to high magnification power of compound microscope, the individual is able to see different structures that are present in cells. while by using lower magnification, the individual is unable to see different structures clearly. So use high magnification in order to study the cell.

6 0
3 years ago
Which of the following is true about the role of genetic and environmental factors in human health?
cricket20 [7]

Answer:

E) Certain environments can lead to an increased risk of developing certain diseases.

Explanation:

The lesson states that specific environments can increase the chance of health problems.

7 0
3 years ago
Important vocabulary continued: what is the difference between a unicellular organism and a multicellular organism?
saveliy_v [14]
Unicellular has one singular cell, multicellular has more than one
3 0
3 years ago
Read 2 more answers
The question is which ecosystem would be more likely to survive if a disease killed the grasses
ivanzaharov [21]

Answer:

I believe the answer is 3

Explanation:

4 0
3 years ago
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