The components that are linked by arrow are:

• Ancient aerobic bacteria enter Ancient Anaerobic Prokaryote to give Primitive Aerobic Eukaryote, which along with Mitochondrion produces Animals, fungi, and nonphotosynthetic unicellular eukaryotes.
• Primitive Aerobic Eukaryote along with Mitochondrion (from previous step) interacts with Chloroplast to produce Plants and photosynthetic unicellular eukaryotes. Nuclear envelope forming is marked on Ancient Anaerobic Prokaryote and Primitive Aerobic Eukaryote.