More deaths than poachers, deforestation or pollution. An estimated 1.3 million animals die every day after being struck by cars and trucks in Brazil, according to a recent study by Centro Brasileiro de Estudos em Ecologia de Estradas. That's 475 million animals every year in one country alone: about 15 animals every second. Over the duration of the study, the team documented the deaths of 165 different species: 10 amphibian, 21 reptile, 63 avian and 71 mammal.
Double fertilization in Arabidopsis. Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm). It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower.
The female gametophyte structure that produces eggs in nonvascular plants are called archegonia. The male structure that produces sperm are called antheridia. A gametophyt â¦ e is the part of the plant that is responsible for creating gametes AKA sexual reproductive cell (sperm or egg).