I will make brainlist plz help me

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

How do the sperm cells get from the stigma to the ovules?

Which of these is not an example of molecular homology? 1. use of dna and rna as genetic material 2.use of glycolysis as the first step in cellular respiration in both plants and animals 3. the lack of an igf-1 gene in prokaryotes 4. the use of aldolase b to break down fructose in bacteria, plants and animals