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
Paladinen [302]
3 years ago
5

The respiratory systems of birds are very efficient at providing oxygen to the blood, which is necessary for birds to expend the

energy necessary to fly. What feature of the bird respiratory system makes it more efficient than the respiratory systems of other animals?
A. a one-way air flow through the lungs and airways
B. a two-way air flow through the lungs and airways
C. bubble-like alveoli for gas exchange in the lungs
D. many tracheal tubes that connect the lungs to the skin
Biology
1 answer:
Murljashka [212]3 years ago
8 0

Answer:

B

Explanation:

Im sooo sorry if its not :(

You might be interested in
Use the sample data below to answer the following question(s). Biologists studying the re-vegetation of two species of succulent
Ipatiy [6.2K]

The probability that they both were planted alone is 0.3325.

<h3>What is genetic probability?</h3>

Probability serves to mathematically estimate the possibility of events that happen by chance, that is, as a matter of luck.

In this case:

  • Number of plants planted alone = 134
  • P(both plants were planted alone) = 134/232 x 133/231 = 0.3325

So the probability that  both were planted alone is 0.3325.

See more about genetic probability at brainly.com/question/851793

#SPJ1

7 0
1 year ago
What is the difference between glycolysis and the Krebs cycle?
xeze [42]

Glycolysis is the first step whereas Krebs cycle is the second step of cellular respiration.

They both formed 2 molecules of ATP along with some carbon as a waste.

6 0
3 years ago
The ____ system is like a chemistry lab which breaks down complex proteins and starches into simple chemicals
Elena-2011 [213]
The answer would be C. Digestive
The <em />circulatory system <em>circulates</em> the blood and lymph throughout the body. The excretory system <em>excretes</em> the body wastes.
7 0
3 years ago
The data obtained from the meselson–stahl experiment after one generation of replication eliminated the dispersive model of dna
Sedaia [141]
<h2>Given statement is false</h2>

Explanation:

According to dispersive model of DNA replication,DNA molecules are hybrids of parental and daughter DNA;In this model each individual strand is a combination of original and new DNA

Meselson and Stahl did an experiment on DNA replication using E.coli bacteria

  • E.coli was grown in a medium containing heavy isotope of nitrogen,bacteria took up the nitrogen and used to synthesize new biological molecules,including DNA
  • It was grown for many generations,the nitrogenous bases of the bacteria's DNA were all labelled with heavy nitrogen
  • Bacteria were then switched to light nitrogen isotope and allowed to grow for several generations
  • They then measured the density of the DNA using density gradient centrifugation
  • This method separates molecules such as DNA into bands by spinning them at high speeds in the presence of another molecule, such as cesium chloride
  • Each DNA produced two DNA molecules each with one new strand and one old strand called semi conservative replication(half of the parental DNA conserved in daughter DNA)
  • Each DNA strand act as a template for synthesis of new strand
  • Hence,dispersive model of DNA was eliminated and semi-conservative model of DNA replication was proved by the above experiment

3 0
3 years ago
Read 2 more answers
hat types of skeletal changes occurred during whale evolution? What change (or transition) in habitat did whales’ ancestors make
nadezda [96]

Answer: D

Explanation: I got it right on the test

8 0
3 years ago
Other questions:
  • Explain how the vaccine makes someone immune to mumps
    10·1 answer
  • If a person consumed the upper amdr limit for protein as part of a diet providing 2500 kcalories, approximately how many grams o
    8·1 answer
  • What factors allow a pool of 20 amino acids to produce thousands of unique proteins? (select the 3 that apply.)?
    6·1 answer
  • Nana has a water purifier that filters \dfrac13 3 1 ​ start fraction, 1, divided by, 3, end fraction of the contaminants each ho
    9·2 answers
  • The ____________ in the alveoli is 40 mm Hg and that of the blood entering the pulmonary capillaries is ____________ . This caus
    15·1 answer
  • What is the nucleolus?
    9·2 answers
  • Describe the feature of cell mbrane​
    10·1 answer
  • During osmosis, which of the following is most likely to pass through a selectively permeable membrane?
    10·1 answer
  • What is chrosome ? (Definition in own words )
    15·2 answers
  • What is the typical configuration of chromosomes in eukaryotic cells?​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!