Single/multi-select question: Does the sentence "The history of ecology in the 20th century is closely tied to that of environmentalism; the Gaia hypothesis, first formulated in the 1960s, and spreading in the 1970s, and more recently the scientific-religious movement of Deep Ecology have brought the two closer together." provide a valid answer to the question "What movement occurred during the 1970s?"
OPT:
1). yes
2). no
1).