How does the whole question go?
Answer:
no
Explanation:
they absorb our oxygen by the wind that blows so they can keep alive
The first organism in the food chain is the producer.
Explanation:
Complete answer:
A mature erythrocyte lacks nucleus and mitochondria so as to make a place for the accommodation of more hemoglobin and hence more oxygen molecules. Lack of such organelles also provides the peculiar biconcave appearance of RBCs that aids in efficient diffusion. Young mammalian RBCs are nucleated.
