Which of these is an example of a chemical change?

A. Setting a piece of paper on fire

O

O

B. Melting iron into a liquid

C. Dissolving salt in water

O

O

D. Breaking a piece of plastic in half

Describe the pros and cons of the treatments used for each of the sickle cell anemia patients investigated in this activity.

What are the necessary components required to start the transcription of a gene? What needs to be added in order to create a protein?

A landfill which a plastic or clay liner that prevents the leaking of waste into soil and groundwater is called? a) a sanitary landfill B) an unsanitary landfill C) a recycling center D) a toxic waste site

How do plants obtain more sunlight

Are mountains, coastlines, and forests considered geologic features?

Which statement best describes the relationship between activation energy and rate of reaction? O Increasing the activation energy can increase the rate of a reaction. O Reducing the activation energy can increase the rate of a reaction.

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.