
Concept explainers
Introduction :
Amphibians are vertebrates. The name Amphibians itself suggests that they can live on both lands as well as in water. They were the first vertebrates who can survive on the land. However, they need water bodies to fertilize their eggs. Amphibians have moist skin and they are tetrapod animals which means they have two pairs of legs viz. Forelegs and Hindlegs. Some have tails while in some tails are absent. Amphibians have three-chambered hearts and they are mostly ammoniotelic.

Answer to Problem 8STP
Correct answer :
Option D) They were the first animals to evolve lungs.
Explanation of Solution
Explanation/justification for the correct answer :
Lungs are the respiratory organs that help in respiration. They are the sac-like structure which is usually present in the pairs in the thoracic cavity. The basic unit of lungs which helps in gaseous exchange is alveoli.
Amphibians were not the first ones to evolve lungs as the lungs were already present in some fishes which are known as Lung Fishes or Dipnoi. They have both the lungs as well as the air bladder to store air and maintaining buoyancy. Three species of Lung fishes are still present on earth and are commonly known as African lungfish, Australian lungfish and American lungfish.
Explanation for incorrect answer :
Option (A) Many lack legs during part of their life cycle. The larvae of amphibians usually lack legs therefore, this statement is correct.
Option (B) Many spend part of their life cycle in water and part on land. As amphibians release their eggs in water bodies, therefore, their larvae develop in water. Hence, they spend the part of their life cycle in the water when in the larvae stage and some part on land when they are adults.
Option (C) Most depends on outside water sources to keep their bodies moist Average sized features are against in population X. Amphibians usually live in moist places such as swampy areas, near the water bodies as they need a water source to keep their body moist.
Chapter 28 Solutions
Biology Illinois Edition (Glencoe Science)
Additional Science Textbook Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Chemistry: Structure and Properties (2nd Edition)
Brock Biology of Microorganisms (15th Edition)
Campbell Biology (11th Edition)
Applications and Investigations in Earth Science (9th Edition)
Campbell Essential Biology (7th Edition)
- There is a species of eagle, which lives in a tropical forest in Brazil. The alula pattern of its wings is determined by a single autosomal gene with four alleles that exhibit an unknown hierarchy of dominance. Genetic testing shows that individuals 1-1, 11-4, 11-7, III-1, and III-4 are each homozygous. How many possible genotypes among checkered eagles in the population?arrow_forwardwhat is this called?arrow_forwardcan you help me identify this it's based on onion rootarrow_forward
- Which evidence-based stress management techniques are most effective in reducing chronic stress and supporting college students’ academic success?arrow_forwardstudents in a science class investiged the conditions under which corn seeds would germinate most successfully. BAsed on the results which of these factors appears most important for successful corn seed germination.arrow_forwardI want to write the given physician orders in the kardex formarrow_forward
- Amino Acid Coclow TABle 3' Gly Phe Leu (G) (F) (L) 3- Val (V) Arg (R) Ser (S) Ala (A) Lys (K) CAG G Glu Asp (E) (D) Ser (S) CCCAGUCAGUCAGUCAG 0204 C U A G C Asn (N) G 4 A AGU C GU (5) AC C UGA A G5 C CUGACUGACUGACUGAC Thr (T) Met (M) lle £€ (1) U 4 G Tyr Σε (Y) U Cys (C) C A G Trp (W) 3' U C A Leu בוט His Pro (P) ££ (H) Gin (Q) Arg 흐름 (R) (L) Start Stop 8. Transcription and Translation Practice: (Video 10-1 and 10-2) A. Below is the sense strand of a DNA gene. Using the sense strand, create the antisense DNA strand and label the 5' and 3' ends. B. Use the antisense strand that you create in part A as a template to create the mRNA transcript of the gene and label the 5' and 3' ends. C. Translate the mRNA you produced in part B into the polypeptide sequence making sure to follow all the rules of translation. 5'-AGCATGACTAATAGTTGTTGAGCTGTC-3' (sense strand) 4arrow_forwardWhat is the structure and function of Eukaryotic cells, including their organelles? How are Eukaryotic cells different than Prokaryotic cells, in terms of evolution which form of the cell might have came first? How do Eukaryotic cells become malignant (cancerous)?arrow_forwardWhat are the roles of DNA and proteins inside of the cell? What are the building blocks or molecular components of the DNA and proteins? How are proteins produced within the cell? What connection is there between DNA, proteins, and the cell cycle? What is the relationship between DNA, proteins, and Cancer?arrow_forward
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education





