What did milankovitch propose as the main cause of ice age

The use of logic making empirical observations and performing dissections were all part of the scientific studies by

What in scientific term why the salty popcorn causes this thirst

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim