Starting with number 1 place each anatomical structure in order from proximal to distal with regards to the pathway of a sperm cell
External urethral orifice 1.
Seminiferous tubules 2.
Epididymis 3.
Ductus deferens 4.
Epididymis 5.
Ampulla of ductus deferens 6.
Membranous urethra 7.
Spongy urethra 8.
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Ответ:
Hemoglobin has a quaternary structure. It consists of two pairs of different proteins, designated the α and β chains. There are 141 and 146 amino acids in the α and β chains of hemoglobin, respectively.