3. Which of the following is responsible for lowering the activation of energy required for a chemical reaction?

Enzyme

Ion

Covalent Bond

Homeostasis

Which statement best describes the relationship between photosynthesis and cellular respiration? (A) Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.

Which statement describes the formation of our sun? A disk formed of long trails of stars coiled into a spiral. It formed an elliptical flattened disk. Heat and gases contracted within a nebula. Gravity pushed stars away from a center core.

Peppered moths come in two colors, black and white. What did Kettlewell show, with regard to peppered moth populations and tree coloring? (Recall that England at the time was heated mainly by coal in urban areas.)

Insertion mutations never cause a shift in amino acids true or false

Explain why invertebrates are placed directly above the phytoplankton in this energy pyramid

Taxonomy is best defined by which of the following phrases? a. the study of the digestive system. b. a group of archaeans that live in deep-sea trenches. c. the process by which a platform obtains energy. d. the science of classification.

Is the stroma involved in the Calvin cycle?

A medical term that means painful or difficult digestion is

The diagram above shows some of the components of the lymphatic system. What is the name and function of the structure indicated by letter B?

Which properties of water plays an important role in the movement of water from the roots to the leaves in plants?