BIOLOGY HIGH SCHOOL

Where would you find the scales of birds?a. on their beaks
b. under their feathers
c. on their wings
d. on their feet

Answers

Answer 1
Answer:


The correct answer is d - on their feet.

The scales found on birds are made of keratin, the same material that forms the beak, claws and spurs.

The scale are mainly found on the toes of the bird and also on the metatarsus. Some may be found a little up the ankle.

The scales of birds were thought to be similar to those  found on reptiles and mammals, but research done in recent times has shown they are somehow different.

 

Related Questions

During a discussion about ecosystems, a student says, "plants eat sunlight, and animals eat other organisms." which response to the students comment is most accurate
Which describes an example of ecological succession?A) A caterpillar developing into a butterfly. B) A meadow replacing a pond in its flood plain. C) A climate gradually changing over many eons and becoming colder. D) The replacement of a native species of animal with an invasive species.
Sweating and panting are examples of which characteristics of life?
A pedigree chart can show a trait that is: dominant, a mutation, both dominant and a mutation
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Which statement below BEST summarizes the role of the DNA molecule in cells?a. guides cell division
b. protects cells from infection
c. provides the instructions for making proteins
d. regulates the chemical processes that provide the cell with energy

Answers

The correct answer is DNA provides the instructions for making proteins.

The replication of DNA aids in protein synthesis. The main function of DNA is to give instructions for making different proteins required by different cells of the body. They give instructions for the arrangement of the of the bases A, T, G, C in the DNA. The different arrangements of these bases results in the production of different kinds of protein. Thus, the DNA gives instructions for protein synthesis.
c. provides the instructions for making proteins

A history of repeated chronic infections due to an acquired B-cell deficiency and decreased antibody production and/or function is usually indicative of

Answers

Answer:

Common variable immunodeficiency disease (CVID).

Explanation:

CVID (Common variable immunodeficiency disease) is a medical disease in which the body suffers from the antibody deficiency. The body get easily attacked by the pathogens in this disease.

The chronic infections get repeated in this disease. The B cell deficiency causes the decreased or non functional antibodies in CVID. Genetic mutations are responsible for this disease.

Thus, the answer is Common variable immunodeficiency disease (CVID).

Using the diagram above, a key characteristic of aquatic dead zones is ________ and which activities is most directly related to the dead zones in the Gulf of Mexico just west of the Mississippi River? A) high concentration of dissolved oxygen, and extensive shrimp fishing
B) low concentration of dissolved oxygen, and farming in the Midwest
C) high concentration of nitric oxides and burning coal to generate electricity in the Northeast.
D) low concentration of dissolved phosphates an Barge traffic on the Mississippi River

Answers

C makes the most sense.

Sorry if I’m wrong

A cell is placed in a water solution with the same salt concentration as the cell. The cell is placed in a _____.

Answers

The right answer is an isotonic solution.

An isotonic solution is a system in which the osmotic concentration is the same as the solute concentration of a cell. In this case, the cell does not swell or shrink because there is no gradient of water concentration across the cell membrane.

The water molecules diffuse across the plasma membrane in both directions, and the rate of water diffusion is the same in each direction of this cell without gaining or losing water.
Isotonic solution. Since it has the same salt concentration as the cell the solution is neither hypotonic or hypertonic.

Eutrophication is always the result of human activity. true or false

Answers

False. Eutrophication is defined as enrichment of nutrients in any bodies of water which can lead to the the death of plants and animals. Eutrophication is not always caused by the activities of human. It is a phenomenon that happens naturally from processes in the water body. However, the activities of human increased the rate of eutrophication. One example of human activity is the use of too much fertilizers wherein the excess amount could run off to a lake or any water body near the site.

Answer:

false

Explanation:

Why is DNA called the blueprint of life?

Answers

Because DNA contains the genes that instruct the cells in how to build proteins. The genetic codes are the blueprints for each protein, and proteins control all biochemical reactions in the cell (as enzymes) and also form the structure of the cell, which becomes the structure of the entire organism. Without knowing how to build proteins, higher organisms would never have evolved.
Other Questions
How does cell technology affect government? 4 New government agencies must be created to fund and regulate each type of technology. 3 A new technology may reduce the amount of money that a hospital needs to operate. 2 Discoveries that are made through cell technology sometimes result in new regulations. 1 New cell technologies might reduce the number of government health-care agencies.
Which of the following is a food chain in the food web shown in the figure below?
A fossil of a fern and other large-leafed plants were found in an area of Alaska. What does this suggest about this area in Alaska?
Which term refers to a solution with more molecules outside the cell than inside the cell?