Muscles tissues are made up of specialized unites called

Cells

Explanation: All living things are made of cells with specific jobs and duties to perform to keep the organism living, such as muscle cells that combine and create muscle tissue, which combines to make the muscular system

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.