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3 years ago

How do scientific models provide a practical solution for some types of research? Check all that apply.

1 answer:

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Models are simplified representations of of different complex systems. They also help to study very small or large objects.

Option B, D and E.

Explanation:

Models are very simplified representations of complex systems and organs or structures which are prepared to study those systems by scientists and normal people easily. Many structures of human body like cells or some tissues are very small in structure or microscopic in nature. So studying them are very hard without specific instruments which are not always available. Thus models are made to easily study those structures by scientists and even normal people and students.

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Describe Lamarck’s idea about how organisms evolved. Use the giraffe’s neck as an example.

Murljashka [212]

Answer

Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring.

Lamarck believed that the stretching elongated the giraffe's neck, which became a useful characteristic and was passed onto future generations. This resulted in the length of the giraffe's neck increasing over time. It is now commonly accepted that Lamarck's ideas were wrong.

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3 years ago

Explain the following <br> Genetics <br> Evolution <br> Variation

NARA [144]

Answer:

genetics;the study of heredity and the variation of inherited characteristics.

evolution;evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection

variation;a change or difference in condition, amount, or level, typically with certain limits

Explanation:

7 0

3 years ago

Read 2 more answers

What should animals with radial symmetry be better able to do than those with bilateral symmetry?

stealth61 [152]

Answer: They should be able to have access and deal with food distributed homogeneously in 360 degreea

Explanation:

This is because radially symmetrical animals meet their environment equally from every sides or angle e.g sessile while Bilateral symmetrical animals can move actively in only horizontal direction, so that they can eat. E.g Arthropods

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3 years ago

Fourteen elements are found in very small quantities in the cell but are required for cells to survive. what are these elements

Alex787 [66]

Certain elements are required in large quantities, and others are required in small amounts by the body, but both are essential for the survival of the cells. The cells which are required in large amounts are called as macronutrients, while the ones required in small quantities are called as micronutrients, or trace elements.

Hence, the answer is trace elements or micronutrients.

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3 years ago

Which statements about the phylogenetic tree are true?

Alex777 [14]

Image is not avilable fo rthe question. The image is attached below:

The phylogenetic tree shown here displays the major clades of chordates.

Which statements about the phylogenetic tree are true?

A) Organism (c) is a common ancestor of lampreys and lungfishes.

B) Birds and ray-finned fishes have a notochord and jaws.

C) Lancelets and coelacanths are more closely related than are chimaeras and coelacanths.

D) Mammals and turtles are more closely related than are lungfishes and sharks.

E) Rays and frogs have vertebrae.

F) Descendants of organism (d) have limbs with digits.

G) Hagfishes, lungfishes, and frogs have lobed fins.

H) Organism (a) is a common ancestor of all chordates.

Answer:

B, D, F, E, H.

Explanation:

A phylogenetic tree is a diagram representing evolutionary relations between species. Phylogenetic trees are not conclusive evidence nor theories. In a phylogenetic tree the pattern of branching illustrates how organisms or other groups developed from a set of similar ancestors.

Some of the examples of phylogenetic tree are as following:

A notochord and jaws includes in birds and ray-finned fishes.
Mammals and tortoises are closer to one another than lungfish and sharks are.
Organic Descendants (d) have wings.
Rays and frogs are columned vertebrally.
A shared ancestor of all chordates is the organism (a).

Hence, the true options are B, D, F, E, H.

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3 years ago