What is a reactant?

an amount of energy that causes a chemical reaction

a substance that is altered in a chemical reaction

a sample of matter that is destroyed in a chemical change

an electron that participates in a chemical bond

In eukaryotic cells, transcription cannot begin until a. the two DNA strands have completely separated and exposed the promoter. b. several transcription factors have bound to the promoter. c. the 5 ′ caps are removed from the mRNA. d.

Which sentence is using passive voice? O The student wrote the essay. The winning goal was scored by Boone. David ran 3 miles in twenty minutes. It took Melissa 30 minutes to drive to the store.

The concept of natural selection is a mechanism of evolution where environmental pressures select for phenotypes that exist in populations based on genetic variation.

Shark pups with the most advantageous traits are more likely to survive and reproduce. For example, pups that can hunt and feed with efficiency directly after being born would have an advantageous trait.

A cell's ability to respond to a hormone is determined by the

Two factors which cause global climate change are listed below. factor 1: mountain building. factor 2: changes in the amount of atmospheric gases. which of these statements is correct about the two factors which cause global climate change?

Is a post oak tree is a autotrophic or heterotrophic

Which of the following statements about wetlands is true

Primary succession is most likely caused by (A) Clear Cutting (B) Climate Change (C) Volcanic Eruption (D) Introduced Species

The resources that are provided by earth are known as resources