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 stamen is the male part of a flower â the reproductive organ that produces the sticky powder known as pollen. The stamen is made up of a filament that holds the anther. The filament is a thin stalk. An anther sits on the tip of each filament and contains the pollen, which is the plantâs male reproductive cell. Pollen fertilizes the ovules or female reproductive cells of the plant. Fertilization results in the formation of seeds. Pistil