Answer:
I agree I think it is 90 :)
Explanation:
"The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago, to the beginning of the Devonian Period, 419.2 Mya.<span> <span>Wikipedia."
https://www.google.com/search?q=He+Silurian+period+occurred&rlz=1C1RUCY_enUS760US760&oq=He+Silurian+...
</span></span>
Answer: The major problem in Mumbai is the growth of squatter settlements known in India as SLUMS. These slums come with many issues for people including the lack of planned access to clean water and sanitation systems, poor health, lack of education, unemployment and the prospect of crime.
Challenging Conditions in the slums:
1. Lack of sanitation is the major issue.
2. Lack of access to clean water.
3. Lack of legal rights.
4. Poor Health.
5. Unemployment and Poor Quality Work.
HOPE IT HELPS YOU☺️
A. the plate tectonic theory is the right answer
6.666 because the formula of time is distance by speed
