Answer:
Origin of cyanobacteria
Origin of chloroplasts
Origin of mitochondria
Origin of multicellular eukaryotes
Origin of fungal/plant symbioses.
Explanation:
At first, all living things on Earth were simple, single-celled organisms like archae and bacteria
Later, the first multicellular organisms evolved where photosynthesis led to a buildup of its waste oxygen, in the atmosphere, leading to the great oxygenation event.
Eukaryotes (complex cells with organelles) diversification accelerated when they started using oxygen for their metabolism.
Sexual reproduction, which involves the fusion of male and female reproductive cells to form a zygote in a process called fertilization is, in contrast to asexual reproduction, the primary method of reproduction for the vast majority of macroscopic organisms, including almost all eukaryotes which includes animals and plants etc, and after that, Earth's biodiversity greatly increased.
