Sperm are the male reproductive cells. Most animals and plants use sperm to reproduce. They have different ways of making and releasing the sperm. In all cases the sperm meets with the egg of the female and grow into a new organism.
What is 'Gross Domestic Product - GDP' Gross domestic product (GDP) is the monetary value of all the finished goods and services produced within a country's borders in a specific time period. Though GDP is usually calculated on an annual basis, it can be calculated on a quarterly basis as well (in the United States, for example, the government releases an annualized GDP estimate for each quarter and also for an entire year).
Media caption The BBC's Declan Curry explains just what GDP stands for, and why we should care GDP, or Gross Domestic Product, is arguably the most important of all economic statistics as it attempts to capture the state of the economy in one number. Quite simply, if the GDP measure is up on the previous three months, the economy is growing. If it is negative it is contracting.