Cycles

Question 1 of 10

The source of energy for the water cycle is the

Question 2 of 10

A frog undergoes metamorphosis from egg to

Question 3 of 10

The process by which nitrogen gas in the air is changed into nitrates in the soil by bacteria is

Question 4 of 10

The process by which plants make food using sunlight is

Question 5 of 10

Which organisms break down dead plants and animals and return nutrients to the soil?

Question 6 of 10

The type of reproduction that involves only one parent is

Question 7 of 10

The stages in the life cycle of a mosquito are

Question 8 of 10

Denitrifying bacteria return nitrogen to the air as

Question 9 of 10

Carbon dioxide is removed from the atmosphere mainly by

Question 10 of 10

The life cycle of a mosquito includes egg, larva, pupa and