We know that the atmosphere became more oxygen rich around 1.8 ga because of geologic evidence such as:

A force that slowly wears away mountains and other features on the surface of Earth is?

The energy of blowing wind can be harnessed to create electricity. Why is wind considered a renewable energy source? A) Wind does not cause destruction of the environment. B) Wind turns the blades of a windmill that creates electricity.

Biology is the study of the interaction between the ___ parts of the environment

Which is a function of cyclins? A) Cyclins are carbohydrates that regulate DNA during the mitosis phase of the cell cycle. B) Cyclins are glycoproteins that repair DNA in the beginning of the cell ccle.

Many bivalves, like scallops, live in salt water. The scallop captures food particles from water that flows over its gills. Which of these is the best classification of the scallop? a. a chunk feeder b. a decomposer c. a filter feeder d. a grazer

How can the period of a pendulum be increased?

A nurse instructor explains the various functions of carbohydrates to a group of student nurses. Which of the following is the correct function of carbohydrates in the human body? Select all that apply. a. Source of energy b.

What is the term for a plant that produces a seed without a protective cover? A. Protostome B. Angiosperm C. Gymnosperm D. Deuterostome

Porcini mushrooms (the reproductive structures of Boletus edulis, a fungus) appear in the forest every summer and fall. Boletus edulis are mycorrhizal fungi and associate with many different species of pine trees.

What does a stage does a cell spend most of its its life in