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Fossils of archaeopteryx. The carliest known bird show which of the following unique characteristics that indicate its dinosaur

Pepsi [2]

Archaeopteryx had "teeth, three claws on each wing" similar to dinosaurs. So, most appropriate answer would be Teeth & Wings

Hope this helps!

6 0

3 years ago

If an allele makes up one fourth of a population's alleles for a given trait, its relative frequency is

alekssr [168]

.25

This is because 1/4 = .25

To find the allele frequency, you need to find the decimal representation of the fraction.

For example: If an allele makes up four twentieths of a population's alleles, then the frequency would be .2 (4/20 = .2)

4 0

4 years ago

Explain why we have different seasons.

Kisachek [45]

Answer:

There is a different reason for Earth's seasons. Earth's axis is an imaginary pole going right through the center of Earth from "top" to "bottom.". Earth spins around this pole, making one complete turn each day. That is why we have day and night, and why every part of Earth's surface gets some of each.

Explanation:

6 0

3 years ago

Read 2 more answers

Interactions between cells always involve a structure known as a

Sladkaya [172]

Answer:

Interactions between cells always involve a structure known as a connexins.

Explanation:

Connexins is composed of specific type of protein called transmembrane proteins. This structure is responsible for the interaction between the cells. Cells communicate with each other by secreting specific chemicals in which information is present. These chemicals consist of neurotransmitter and harmones.

5 0

4 years ago

Diagnose: Mrs. Harris is a 60 year old white woman. She has noticed in recent years that her height has slightly decreased. Rece

Brut [27]

Answer:

Q: Which skeletal system disorder might she be suffering from?

A: Osteoporosis

Q: What techniques could be used to diagnose her condition?

A: Bone mineral density (BMD) test or dual energy X-ray absorptiometry (DXA) scan

Q: What treatments are available?

A: Medication, healthy food.

Explanation:

The vertebral discs between vertebrae could shrink with age. Therefore, a height loss up to 1-inch is normal. However, if the height loss is more then it is possibly due to osteoporosis.

A bone mineral density test, also known as dual energy X-ray absorptiometry scan, is a well-adapted test to measure the amount of calcium and other minerals in the bones. It uses X-rays to measure the content of calcium and thus strength of bones.

A person who is already suffering from osteoporosis should be treated with medicine right away so that it stops further deterioration of the bones and avoid any future bone fractures. Further, it can be handled by eating a healthy diet and supplements such as vitamins D. In case some of the bones/vertebrae are already fractured, surgical approaches might be necessary.

8 0

4 years ago