1.Look at the picture and label parts of the fish.

The anatomy of Lampanyctodes hectoris

(1) - operculum (gill cover), (2) - lateral line, (3) - dorsal fin, (4) - fat fin, (5) - caudal peduncle, (6) - caudal fin, (7) - anal fin, (8) - photophores, (9) - pelvic fins (paired), (10) - pectoral fins (paired)

2.Word building.

noun	verb	adjective
		diverse
dependency
alteration
		challenging
	to apply
	to be ready
	to be able
behaviour

3.Give opposite meaning to the words from the box and insert them in the sentences of your own.

appear, familiar, vertebrate, dependent, important, to cover, natural, regular

dis-, un-, in-, ir-

4.Choose the correct word to complete the sentences.

fins aquatic habitat flattened vary evolved existence gill

Fishes have been in ......................... for more than 450,000,000 years, during which time they have ........................... to fit into almost every type of ..................... The popular conception of a fish as a slippery, streamlined aquatic animal that possesses fins and breathes by ................... supplies to many fishes, but far more fishes deviate from that conception than conform to it. For example, the body is elongate in many forms and greatly shortened in others; the body is .......................... in some (principally in bottom-dwelling fishes) and laterally compressed in many others; the ...................... may be elaborately extended, forming intricate shapes, they may be even lost; and the positions of the mouth, eyes, nostrils, and gill openings .............................. widely.

Working with word combinations and sentences

5.Give English equivalents to the following word combinations.

Пресная вода, многочисленные и многообразные виды, определенные черты, жаберные щели, паразитический образ жизни, хрящевые рыбы, костные рыбы, находящие друг на друга пластины, огромная важность, очевидная причина, запас продуктов, неисчерпаемый источник, изменение окружающей среды, личинка москита, заболевание, переносимое москитами, привыкнуть к неволе, держать рыбок, создавать трудности.

6.Match a word in a to its definition in b. Write your own sentences with these words.

A		B
1	obvious	a	something that needs a lot of energy or skill to deal with
2	to realize	b	able to change easily
3	flexible	c	begin to understand something
4	challenge	d	clear to understand
5	distinct	e	an important part or aspect of something
6	feature	f	to use or have smth at the same time as someone else
7	to share	g	separate and different