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Concept explainers
(a)
To infer:
About the relative costs and benefits of large brains documented in the fossil records of certain lineages of humans and other animals.
Concept introduction:
Animals with larger brain size are considered as more intelligent and hence they are more successful than animals with smaller brain size. The larger brain size can also help an animal in obtaining mates and therefore can increase their survival.
The larger brain size involves a higher cost, but it is outweighed by the survival benefits that an animal gets.
(b)
To hypothesize:
In what way the natural selection might have favored the evolution of large brains despite their high maintenance costs.
Concept introduction:
Animals with larger brain size are considered as more intelligent and hence they are more successful than animals with smaller brain size. The larger brain size can also help an animal in obtaining mates and therefore can increase their survival.
The larger brain size involves a higher cost, but it is outweighed by the survival benefits that an animal gets.
(c)
To graph:
The data for 14 bird species and conclude about the relationship between brain size and mortality.
Concept introduction:
Animals with larger brain size are considered as more intelligent and hence they are more successful than animals with smaller brain size. The larger brain size can also help an animal in obtaining mates and therefore can increase their survival.
The larger brain size involves a higher cost, but it is outweighed by the survival benefits that an animal gets.
Graphical representation:
The graph between the mortality rate and deviation of brain size from expected is shown below:
Graph 1: Relationship between the mortality rate and deviation of brain size from the expected value. The x-axis represents the deviation of brain size from expected and the y-axis represents the mortality rate.
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Chapter 27 Solutions
Campbell Biology In Focus
- 18. Watch this short youtube video about SARS CoV-2 replication. SARS-CoV-2 Life Cycle (Summer 2020) - YouTube.19. What is the name of the receptor that SARS CoV-2 uses to enter cells? Which human cells express this receptor? 20. Name a few of the proteins that the SARS CoV-2 mRNA codes for. 21. What is the role of the golgi apparatus related to SARS CoV-2arrow_forwardState the five functions of Globular Proteins, and give an example of a protein for each function.arrow_forwardDiagram of check cell under low power and high powerarrow_forward
- a couple in which the father has the a blood type and the mother has the o blood type produce an offspring with the o blood type, how does this happen? how could two functionally O parents produce an offspring that has the a blood type?arrow_forwardWhat is the opening indicated by the pointer? (leaf x.s.) stomate guard cell lenticel intercellular space none of thesearrow_forwardIdentify the indicated tissue? (stem x.s.) parenchyma collenchyma sclerenchyma ○ xylem ○ phloem none of thesearrow_forward
- Where did this structure originate from? (Salix branch root) epidermis cortex endodermis pericycle vascular cylinderarrow_forwardIdentify the indicated tissue. (Tilia stem x.s.) parenchyma collenchyma sclerenchyma xylem phloem none of thesearrow_forwardIdentify the indicated structure. (Cucurbita stem l.s.) pit lenticel stomate tendril none of thesearrow_forward
- Identify the specific cell? (Zebrina leaf peel) vessel element sieve element companion cell tracheid guard cell subsidiary cell none of thesearrow_forwardWhat type of cells flank the opening on either side? (leaf x.s.) vessel elements sieve elements companion cells tracheids guard cells none of thesearrow_forwardWhat specific cell is indicated. (Cucurbita stem I.s.) vessel element sieve element O companion cell tracheid guard cell none of thesearrow_forward
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