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

Which is an example of genetic drift? O A. Disruptive selection divides a population into two new species. O B. The allele frequency of a population changes due to a bottleneck effect. O C. Selective breeding creates a new species of dog. O D.

What structural advantage is provided to stems that have theirvascular tissue arranged in a ring near the periphery of thestem?

The water at the top of the water fall has ___ energy a. Potential b. kinetic c. heat d. Metabolic

A caregiver asks the nurse what the caregiver can give a 9-year-old child for a headache. what is the nurse's best response?

Explain why scientists use the metric system for scientific measurements.

What type of cells are produced after fertilization occurs and the gametes combine? A) an egg cell B) a sperm cell C) a diploid zygote D) a haploid zygote

On a hot summer day, you notice a line of dark clouds forming. based on this observation, you go back inside and get an umbrella. what scientific skill have you used.

Which of the following is an example of a cultural control of pests? using natural pest predators using pest hormones using synthetic pesticides keeping homes clean

Why do microbiologists often disinfect work areas before working with bacterial cultures?

According to the animation, to what genetic element does the rna polymerase bind? according to the animation, to what genetic element does the rna polymerase bind? the operator the repressor mrna the repressor protei