What is activation energy?

the energy needed to get a reaction started

the energy stored in the bonds of a reaction's enzyme

the energy absorbed by the bonds that form in a reaction

the heat energy given off by a reaction

Why did Darwin use the phrase "descent with modification" rather than "evolution"?

Flesh-eating parasitizing maggots are the offspring of the fly, Ormia ochracea, which invaded Hawaii from North America. The adult flies follow the chirps of a calling cricket and then deposit wriggling maggots onto the cricket's back.

What are the four characteristics of living things?

Reference books or histories that provide information on the person are examples of a. primary sources c. third party sources b. secondary sources d. none of these

Just like animals on land, fish also need oxygen to survive, but rather than breathing air, fish obtain their oxygen from the oxygen that is dissolved in water. Once absorbed, the oxygen is delivered to the cells for aerobic respiration.

Summary of newton's laws and their importance to daily lives

Explain what is meant by the statement cleaner than coal

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