By Levels

Library

EXP: 08888
HITS: {{lyricTraining.hits}}888
STREAKS: {{lyricTraining.streaks}}888
TIME: {{lyricTraining.timeout / 1000}}88
{{word.word}}

{{cue.translated_text}}

{{lyricTraining.hint}}

x{{playblackSpeed.toFixed(2)}}

Loading ..

Not Found

{{annotation.word}} ({{annotation.pos_simplify}})

/{{annotation.phonetic}}/

{{annotation.translation}}

{{annotation.name}}

{{annotation.sub_type}}

{{annotation.definition}}
Back

Games & Quizzes

Training Mode - Typing
Fill the gaps to the Lyric - Best method
Training Mode - Picking
Pick the correct word to fill in the gap
{{game.name}}
{{game.description}} Requires {{game.required_annotions}} vocabulary annotations

Congratulations! You gained {{totalPoint}} XP

You may need to watch a part of the video to unlock quizzes

Don't forget to Sign In to save your points

Repeat Skip ({{game.question_index}}/{{game.questions.length}})
{{part}}
Repeat Skip ({{game.question_index + 1}}/{{game.questions.length}})
{{choice.text}}
{{choice.text}}

Make correct pairs from two columns

{{lyricTraining.finished && lyricTraining.timed_out ? 'Timed Out' : 'Challenge Accomplished'}}

PERFECT HITS {{lyricTraining.stats.PERFECT_HITS}} +{{lyricTraining.stats.PERFECT_HITS * 20}}
HITS {{lyricTraining.stats.HITS}} +{{lyricTraining.stats.HITS * 10}}
LONGEST STREAK {{lyricTraining.stats.LONGEST_STREAKS}} +{{lyricTraining.stats.LONGEST_STREAKS * 10}}
REMAINING TIME {{lyricTraining.timeout / 1000}}s +{{lyricTraining.timeout / 1000}}
TOTAL +{{lyricTraining.exp}}
{{word.word}} - {{dictionary.definition[0].phonetic || ("/" + dictionary.phonetics +"/")}} - {{word.translation}}

We couldn't find definitions for the word you were looking for.
Or maybe the current language is not supported

{{simpleDefinition.pos}}

{{simpleDefinition.def}}

{{word.word}}

Sentences & parts of speech:

  • {{tag.normal}} {{tag.pos_name}}

  • {{c.startTime | duration}}


    {{c.translated_text}}

All {{pos.pos_simplify}}
{{a.word || a.name}}
/{{a.phonetic}}/
{{a.type || a.sub_type}}
{{a.translation}} 		{{a.definition}}

Population diversity and resilience | Natural selection | AP Biology | Khan Academy

6,665 views

Khan Academy

Video Language:

  • English

Caption Language:

  • {{captionLanguage | language_name}} ({{captionLanguage}})

Accent:

  • English (US)

Speech Time:

97%
  • 4:22 / 4:29

Speech Rate:

  • 184 wpm - Fast

Category:

  • Education

Tags :

Intro:

Video Vocabulary

population

/ˌpäpyəˈlāSH(ə)n/

noun

Number of people who live in a country, area etc..

covered

/ˈkəvər/

verb

To discuss a subject in a talk or meeting.

circles

/ˈsərk(ə)l/

noun other verb

shape. Perfectly round shapes. To enclose in something round by surrounding it.

represent

/ˌreprəˈzent/

verb

be entitled to act for someone.

because

/bēˈkəz/

conjunction

For a reason.

something

/ˈsəmˌTHiNG/

adverb pronoun

used for emphasis with following adjective functioning as adverb. thing that is unspecified or unknown.

question

/ˈkwesCH(ə)n/

noun verb

sentence worded or expressed so as to elicit information. To have or express concerns or uncertainty.

camouflage

/ˈkaməˌflä(d)ZH/

noun verb

military disguise. To hide by blending it into its background.

genetic

/jəˈnedik/

adjective

Of, relating to, or controlled by genes.

separate
adjective noun verb

forming or viewed as unit apart or by itself. individual items of clothing suitable for wearing in different combinations. cause to move or be apart.

environment

/inˈvīrənmənt/

noun

Natural world in which plants and animals live.

generally

/ˈjen(ə)rəlē/

adverb

Usually; as a rule; by, to or for most people.

different

/ˈdif(ə)rənt/

adjective

Not of the same kind; unlike other things.

surface

/ˈsərfəs/

adjective noun verb

Of the top layer; not deep or meaningful. outside part or uppermost layer of something. To give (road) a top layer.

Q
W
E
R
T
Y
U
I
O
P
A
S
D
F
G
H
J
K
L
Z
X
C
V
B
N
M