Question

17 multiple choice 1 point below what oxygen level do most marine organisms die? 1.5 ppm 5 ppm 0.5 ppm 2 ppm 18 multiple choice 1 point the gulf’s dead zone reached a record size of 22,000 square km in what year? 2020 2002 1990 2010

Explanation:

Question 17

Most marine organisms cannot survive below an oxygen level of 1.5 ppm. This is a known threshold in marine biology related to dissolved oxygen requirements for marine life.

The Gulf of Mexico's dead zone reached a record size of 22,000 square km in 2010. This is a fact related to environmental science and the study of dead zones in marine ecosystems.

Answer:

A. 1.5 ppm

Question 18