Dr. Ignaz Semmelweis was a Hungarian doctor investigating the deaths of women in his maternity ward from childbed fever. Which statement below is a valid hypothesis made by
Dr. Semmelweis?
O Doctors caused childbed fever.

Midwives caused childbed fever.

If doctors disinfect hands before delivering babies, then there will be less childbed fever.

o If a woman goes into the hospital then she will die of childbed lever.

The investigation for death of women in maternity ward is identified by scientific method of hypothesis testing.

The null hypothesis statements and alternative hypothesis statement can be as,

H0 : Doctors caused child bed fever.

Ha : Midwives caused child bed fever.

Child bed fever is the infection in some part of female reproductive organs usually ovary which causes the abortion of a child or premature child birth.

The hypothesis to check Dr.Ignaz have to make a null hypothesis statement against which there will be alternative hypothesis statement which will cause the observation and then reaching a conclusion.

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a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.