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Biology

Camouflage is a self- depend method of

creatures to escape from predators by

changing colour of their bodies to blend in

with their environment.In the listening, the professor is

discussing how the cuttle fish changes its

colour to camouflage itself. It does this by

using various pigments in its body to hide

from potential enemies. This is a common

method of self protection that can be found

not only in cuttle fish but also in other

species of fish

According to reading, humans require a

right amount of sleep to maintain cognitive

function of their brains.

In the listening, the professor takes an

example as to how sleep is important to

humands. He refers to a test in which the

study subject was required to type a chain

of number over and over again on a

keyboard. Those who get 8 hours of sleep

was very accurate in typing that chain ofnumber but only in the morning and less

accurate in the afternoon. They also did

poorly when they also get about 4 hours of

night sleep. An average man require 6 to 8

hours of sleep everyday or else that person

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cog native function will suffer.

According to the reading, ecosystem is a

group of both living and non-living entities

that forms various inter-relationship.

In the listening, the professor is

discussing an oil spill in the Great Barrier

Reef. The oil killed countless fish which in

turn decompose and turn into angy. The

angy could have killed the reef because

they block the sunlight but there was the

fish. In the reef that ate all of the excess

angy just saving the reef in there.

This example shows how ecosystem

inter-relates and because the life cycle of

the reef was not broken if didnt die in

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constract it propers as the can be seen from

the reading.

According to the reading , symbiosis is

the relationship between two different

organisms living together in which at least

either benefits from the relationship.

In the listening, the clown fish lives in

the tentacles of the sea anemone and

protects them from protential predators.

The sea enomone can use its tentacles to

sting fish. But the clawn fish adapts to

those by a kind of new mucus on its body.

This is a symbiosis relationship because

the two species live together and the sea

enomies really benefits from that

relationship.

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According to the reading, eusocial

species is able to produce sterile member

that perform various tasks for the

productive member.

In the listening, the professor is

discussing termite as an example of

eusocial. Termites organizes themselves

into sterile and fertile members. Sterile

members are worker and soldier. While the

productive members are the queens and

pertile males. Termites are eusociality

because they genetically differentiated into

both sterile and fertile members. The sterile

members perform specific tasks to serve

the productive members of the swam.

According to the reading, mimicry is the

ability of animal to appear to be other thing

or organisms to deceive both predators andpreys.

In the listening, the professor refers to

mimicry of both stick and leaf insects. The

stick insect looks just like a stick from a

plant on tree. And the leaf insect appears

seems to be a leaf from a tree going in its

surrounding. Both these insects resort to

mimicry to plain in with their environment

there by hiding from their predators that

might otherwise have eaten them.

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