A biomass pyramid differs by showing the __ at each trophic level.

A) numbers of organisms

B) weight of organisms

C) mass of elements

D) mass of organic matter

Which process was most likely used to alter these mosquitoes

Interferons are cytokines produced by host cells in response to intracellular infection. There are two types of interferons, type I and type II. Which of the following is a difference between these two types? Choose one: A.

Cystic fibrosis, a genetic disorder characterized by pulmonary and pancreatic dysfunction, usually appears in young children but can also affect adults.

Multiple Choice Which of the following is not a reason green algae are classified as plants? A. They have cellulose in their cell walls. B. They have chlorophyll a and b. C. They have genes similar to genes in land plants. D.

How has the climate of northeastern United States changed over the past 200 million years

Fred went to the doctor because his body was not producing semen. Which part of Fred's body was most likely functioning incorrectly to cause this problem.

What do metabolism, respiration, and digestion have in common? They break larger molecules into smaller ones. They build larger molecules. They are each single chemical reactions. They each involve multiple chemical reactions.

The possibility of down syndrome and other chromosomal disorders increases as the mother's age increases because

What happens during the light reaction of photosynthesis? A. Water molecules combine to make food. B. Air and water create energy for a plant. C. Carbon dioxide is combined with glucose. D. Water molecules split apart.

The purpose of a mordant in the Gram stain is to:a. remove the simple stain. b. make gram-negative cells visible. c. prevent the crystal violet from leaving the cells. d. make the bacterial cells larger. e. make the flagella visible.