16. Organism A: Fish Class: Pisces Reason: Has a streamlined body, scales, fins, and gills for gaseous exchange. Class: Pisces, Reason: Streamlined body, scales, fins, gills Organism B: Millipede Class: Myriapoda Reason: Has an elongated segmented body, many pairs of legs, and antennae. Class: Myriapoda, Reason: Segmented body, many legs, antennae 17. a) A: Urinary bladder B: Testis A: Urinary bladder, B: Testis b) i) Sertoli cells: Provide nourishment and support to developing sperm cells (spermatids) during spermatogenesis. They also form the blood-testis barrier. Provide nourishment and support to developing sperm cells

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Organism A: Fish

April 24, 2026Biology

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Organism A: Fish Class: Pisces Reason: Has a streamlined body, scales, fins, and gills for gaseous exchange.
$\boxed{\text{Class: Pisces, Reason: Streamlined body, scales, fins, gills}}$
Organism B: Millipede
Class: Myriapoda
Reason: Has an elongated segmented body, many pairs of legs, and antennae.
$\boxed{\text{Class: Myriapoda, Reason: Segmented body, many legs, antennae}}$
a) A: Urinary bladder B: Testis
$\boxed{\text{A: Urinary bladder, B: Testis}}$
b) i) Sertoli cells: Provide nourishment and support to developing sperm cells (spermatids) during spermatogenesis. They also form the blood-testis barrier.
$\boxed{\text{Provide nourishment and support to developing sperm cells}}$

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