Chicken pox is a virus that causes an itchy rash but typically does not have any major or lasting effects on an infected person. before 1995, chicken pox parties were popular. in a chicken pox party, healthy children were brought around children who were sick with chicken pox so that they would be exposed to the virus and their immune system would learn to fight it. a vaccine for chicken pox was developed in 1995, and chicken pox parties are now rare. what best describes how vaccines have advanced science?

Asap timed! 1. ice core samples from glaciers ice caps contain bubbles of ancient atmosphere that are in layers based on age. what questions are scientists most interested in? a. how the amount of water vapor needed to make the ice has changed b. how the amount of ozone has changed over time.c. how the amount of ice in each layer has changed over time d. how the amount of carbon dioxide has changed over time 2. what produces milankovich cycles ? a. sunspots ams solar flare on the suns surface b. changes in the earths orbit c. gravitational changes bases on the position of the sun and the moond. cycles of vegetation that result in desert and rainforest conditions

Which of the following occurs after a natural or unnatural disturbance in an ecosystem

As a small change in a person's dna can cause a genetic disorder