How oxygen is obtained by cells and How cells obtain nutrients
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Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which are characteristics of flukes? check all that apply. a they are free living. b they are a type of flatworm. c they reproduce sexually. d they have eyespots. e they are segmented.

What is a dendrite and what does it do?