The haploid cells join during sexual reproduction are called ? a) stamens
b) spindles
c) pistils
d) gametes

Gametes

Explanation:

Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome.

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