What piece of scientific knowledge was Semmelweis missing to explain his
discovery?
The hygiene hypothesis
Pastuerization theory
The germ theory of disease

the germ theory of disease

The germ theory of disease.

Explanation:

Ignaz Philipp Semmelweis is widely credited with the invention of the use of antiseptics in the reduction of puerperal fever in clinics.

However, the piece of scientific knowledge that he was missing to explain his discovery was the germ theory of disease.

b: the establishment clause  

b: socialism  

valentina tereshkova

soviet cosmonaut valentina tereshkova became the first woman to fly to space when she launched on the vostok 6 mission june 16, 1963. valentina tereshkova was the first woman to go into space. in 1963, she spent almost three days in space and orbited earth 48 times in her space capsule, vostok 6.jan 22, 2018