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Debora [2.8K]
2 years ago
14

In 2000, Bob Harmon discovered the best-preserved Tyrannosaurus Rex skeleton ever found. The fossilized dinosaur was sticking ou

t of the wall of a canyon in Montana. Many scientists were eager to study the fossils. Dr. Mary Schweitzer got one of the leg bones to analyze. Dr. Schweitzer's assistant dissolved the bones in acid and discovered that some soft tissue had survived even after 68 million years. The discovery was a shock to the scientific community. No one had ever found such old tissues. Dr. Schweitzer found structures identical to modern red blood cells and blood vessels inside the bone.
Which organ system do blood cells and blood vessels belong to?


A.circulatory system

B.nervous system

C.skeletal system

D.respiratory system
Biology
1 answer:
irakobra [83]2 years ago
3 0
A, the circulatory system
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A student used a microscope to observe Elodea submerged in a solution. The student observed the cell cytoplasm pull away from th
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Answer:

A

Explanation:

The correct answer would be that <u>the cell was submerged in a hypertonic solution.</u>

<em>A hypertonic solution is a solution with a higher concentration of solutes than that of the cytosol of a cell suspended in it. When a cell is suspended in a hypertonic solution, water moves osmotically from the cytosol to the hypertonic solution. This causes the cytoplasm to collapse and the cell becomes flaccid. </em>

The correct option is A.

7 0
2 years ago
This glandular tissue resembles that of the salivary gland (clusters of zymogenic cells). What feature unique to the pancreas wo
leva [86]

Answer:

Seen on the explanation.

Explanation:

Glandular tissues are a mixture of both endocrine (ductless, hormones are secreted directly into the blood) and exocrine (have ducts, hormones are secreted into surfaces) glands.

The pancreas and salivary glands are both exocrine glands although the pancreas has an endocrine function via the islets of Langerhans, both aid in the digestion of food.

The pancreas lacks striated ducts and the intralobular duct is similar to the intercalated duct of salivary glands. It often has a collapsed lumens and the cells are cuboidal with little cytoplasmic staining in contrast to acinar cells.

The pancreas can also be distinguished from the parotid gland by the presence of the pancreatic islet (islets of langerharns) which has an endocrine function.

5 0
2 years ago
Which statements describe analogous structures? Select three options. Analogous structures indicate a common ancestor. Analogous
Vinil7 [7]

Answer:

The correct answers are:

Analogous structures do not indicate a common ancestor. Analogous structures have the same function but a different structure. An example of an analogous structure is the wing of a bat and a butterfly.

Explanation:

Analogous structures are the structures that have a similar function in various organisms but their anatomic structure is different from one another in reality. Analogous structures are do not indicate a common ancestor.

An analogous structures example is the wings of the bat and butterfly as they are both used for flying but their structure is different anatomically from one another.

6 0
2 years ago
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Which is the best example of a hypothesis leading to new experimental methods? Gregor Mendel influenced the development of the t
mr_godi [17]

The answer would be C. Thomas Hunt Morgan continued the genetic research of Gregor Mendel, but Morgan used fruit flies.

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2 years ago
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An efficient way to search for and insert a value in a cell when the desired value is stored elsewhere in the worksheet or even
MAVERICK [17]

Answer:

An efficient way to search for and insert a value in a cell when the desired value is stored elsewhere in the worksheet or even in a different workbook is by using lookup functions.

Explanation:

  • Lookup function is the built in function of excel that helps in returning the certain value form specific row or column.
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