Water flows from areas of weak salt solution to areas of strong solution in an effort to dilute the salt solution in a process called ____________________.
Fill in the blank(s) with correct word
Question 2Most fish are covered with ____________________, which are thin, bony plates that overlap each other and provide protection.
Fill in the blank(s) with correct word
Question 3The earliest known fish lived in the Ordovician period and were called ____________________.
Fill in the blank(s) with correct word
Question 4Gouramis are:
A) mouth-brooders
B) nest-builders
C) live-bearers
D) egg-buriers
Question 5What causes slime disease?
A) parasites
B) bacteria
C) viruses
D) fungi
Question 6Which of these factors does NOT contribute to an increase in ammonia and nitrates in an aquarium?
A) overpopulation of fish
B) dirty filters
C) overfeeding that leads to an accumulation of uneaten food
D) too-frequent water changes
Question 7Which type of aquarium is cheapest to purchase?
A) Plexiglas
B) all-glass
C) acrylic
D) soft plastic