Cardiovascular fitness uses which of the following body systems?
a. circulatory and digestive
b. circulatory and respiratory
c. digestive and respiratory
d. respiratory and muscular

There are six elements that make up most of the human body. which of the following is not one of these six elements?

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

Talking listening and reacting non verbally are all part of communicating