Organisms that can't live in the presence of oxygen are called facultative anaerobes.
a. true
b. false

False

Explanation:

Facultative anaerobes are organisms that can grow in both the presence or absence of oxygen.

Organism that suffer a poisonous reaction or that can't live in the presence of oxygen are called obligate anaerobes.

climate change and pollution

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.