Page 24 - Science Course 2 (Book 1)

Mo1-L3b: What are the Groups of Chordates?

Key Concept SUMMARY
What is a Chordate? What is a Chordate?
There are two types of chordates—vertebrate
What is the difference between invertebrate and chordates and invertebrate chordates.
vertebrate chordates?

Invertebrate chordates do not have a
backbone and include lancelets and tunicates.

ectotherm
Mo1-L3b What are the Groups of Chordates?
an animal that heats its body from heat in its
environment.
KEY CONCEPTS:
1. How do the groups of vertebrate chordates differ?
DAY NIGHT
o
Air Temperature : 30 c Air Temperature : 20 c
o
o
Body Temperature : 37 c Body Temperature : 20 c
o
Vocabulary A-Z Ectotherms depend on heat ectotherms changes when the
The Internal temperature of
exchange with the external
Let us learn some vocabulary environment. environmental temperature
changes.
endotherm
Gill an animal that generates its body heat from the
inside.
an organ that exchanges carbon dioxide for
oxygen in the water. DAY NIGHT
o
Air Temperature : 30 c Air Temperature : 20 c
o
o
Body Temperature: 37 c Body Temperature: 37 c
o
Ectotherms require a lot of Endotherms can maintain
food to fuel their high a constant internal
metabolism temperature.
amnion
a protective membrane that surrounds an embryo.
mammary glands
special tissue that produces milk for young
mammals.

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