Which of the following is a chemical barrier that is able to destroy the cell walls of certain harmful bacteria?
a. mucus membranes
b. skin
c. white blood cells
d. enzymes in tears

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

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

The term facultative anaerobe refers to an organism that