1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Debora [2.8K]
3 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]3 years ago
3 0
A, the circulatory system
You might be interested in
When wine matures in wood, color, bouquet, flavor, and tannins are extracted from the inside surface of the tank or barrel. also
Leona [35]
Oxygen dependent maturation of the wine

concentration of the wine when water evaporates is your answer .-.
6 0
2 years ago
List three characteristics that determine the structure of aquatic ecosystems.​
Alinara [238K]
Depth, flow, temperature, and chemistry of overlying water
3 0
3 years ago
Can y’all please help me with this
zaharov [31]
“C” is the correct answer
8 0
3 years ago
When Charles Darwin considered some of the unique structures found in modern animals, like the feathered wings of birds, he famo
REY [17]

<u>Answer:</u>

Charles Darwin’s study of evolution predicts that genetic evidence would show that all organisms share a common ancestor.

Option: (B)

<u>Explanation: </u>

  • Through his "theory of evolution", Darwin found that the species exist and new species form based on natural selection.
  • He studied the animals and birds in Galapagos island for his evolution theory.  

<u>The four key points of Darwin's Theory of Evolution:</u>

  • individuals of any species are not identical;  
  • genes are passed from one 'generation' to another;
  • more offspring are born than can survive;  
  • only the 'survivors of the competition' for the resources will reproduce.

7 0
3 years ago
In an experiment two potted plants, labeled Plant 1 and Plant 2, are placed in transparent plastic bags and left in the open. So
Sloan [31]

Answer:

Its D. role of carbon dioxide in photosynthesis.

Explanation:

I know its right bc I just got that question.

7 0
3 years ago
Other questions:
  • Describe TWO WAYS technology has created more waste by humans.<br><br><br>I need an answer now.
    13·1 answer
  • Which component of the meninges is responsible for removing metabolic wastes?
    15·2 answers
  • Non-photosynthesizing organisms (like humans) must obtain which three basic types of nutrients from their environment?
    14·1 answer
  • Why does the reporter have a tube up his nose? why does the reporter have a tube up his nose? to replace the salts and other ion
    13·1 answer
  • What is an asscaris​
    8·2 answers
  • What is the primary function of the respiratory system?
    8·1 answer
  • Are atoms completely lost or gain in a chemical re
    8·1 answer
  • does the presence of introns exons in eukaroytic cells provide more potentia diversity in gene products than is possible in pork
    8·1 answer
  • Http://kippmemphisburesh.weebly.com/uploads/2/2/5/8/22584312/quiz_10_pdf.pdf
    15·1 answer
  • What is the genotype and phenotype for A male hemophiliac with a woman pure for normal clotting.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!