Answer:
Option A, most closely related to mammals
Explanation:
Insects like arthropods and molluscs have an open circulatory system and thus do have a distinguishable heart. Fish has two chambered heart. Reptiles have three chambered heart. Amphibians too have a three chambered heart.
All mammals and fish have four chambered heart. The right and left sides of the chambers have restricted entry and hence remain intact from each other
Hence, option A is correct
Respiration is the reverse of Photosynthesis.
Answer:
hydrogen, oxygen, carbon and nitrogen
I did 4 instead :')
Explanation:
The vinegar had turned the whites of the egg clear, so you can see in it.
Hope this helped :)