2.Analiza las situaciones y responde: “En una charca se encuentra poblaciones de sapos y de mosquitos. ¿Cómo crees que se vería afectada la densidad de cada población si se produjera algunos de los siguientes cambios?

a. Una inundación.
b. Se eliminan los insectos por fumigación.
c. Se mueren todos los sapos.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation:

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.