What would happen if all individuals in a species were sterile (not able to have babies)? Reproduction is NOT essential for the survival of an individual ______________ but is essential for the survival of the _____________. What is meant by extinction? There are two basic kinds of reproduction: sexual and asexual. Sexual reproduction requires that two cells (sperm and egg) unite to produce the first cell of the new organism. Organisms reproducing sexually do not always have ?sex!? In many cases sperm and egg are released into the water where they meet. Most familiar organisms ? from maple trees to birds and bees ? reproduce sexually. In asexual reproduction, a single organism can reproduce without the aid of another. Sometimes these organisms can just divide themselves in two! Name and define the two basic kinds of reproduction. Identify which organisms are reproducing sexually and which are reproducing asexually. BACTERIA HYDRA SEA URCHIN 3. GROWTH AND DEVELOPMENT Adults don?t always look like the babies of a species. All organisms begin their lives as single cells. Over time, these organisms grow and take on the characteristics of their species. Growth results in an increase in the amount of living material and the formation of new structures. All organisms grow, and different parts of organisms may grow at different rates. Organisms made up of only one cell may change little during their lives, but they do grow. On the other hand, organisms made up of numerous cells go through many changes during their lifetimes. Think about some of the structural changes your body has already undergone in your short life. All of the changes that take place during the life of an organism are known as its development. How do all organisms begin life? What is the difference between growth and development? Do unicellular organisms GROW? Do unicellular organisms DEVELOP? Do multicellular organisms GROW? Do multicellular organisms DEVELOP? Identify which graphic BEST shows growth and which BEST shows development. _________________________ ________________________ A snowball grows when you roll it over fresh snow! Why isn?t it a living thing? The growth of the snowball is not internal. It does not grow by producing more cells like organisms. It just adds on more material to the outside. Someone has to roll the snowball. It won?t grow bigger by just sitting there and it certainly cannot change liquid water or solid ice into new snow from which it can grow larger. This is one of the differences between growth of a living thing and growth of a nonliving thing. How is the growth of a living thing different from the growth of a nonliving thing? 4. OBTAIN AND USE ENERGY Energy is the ability to make things change. Energy is important because it powers life processes. It provides organisms with the ability to maintain balance, grow, reproduce, and carry out other life functions. Some organisms obtain energy from the foods they eat or, in the case of plants and several other types of organisms, the foods that they produce. Organisms that get energy from the food they eat are called heterotrophs. Organisms that use energy from the sun to make their own food (which they then use for energy) are called autotrophs. The process is called photosynthesis. As you?ll learn, energy doesn?t just flow through individual organisms; it also flows through communities of organisms, or ecosystems, and determines how organisms interact with each other and the environment. Define energy. Why is energy important to a living organism? What is the difference between an autotroph and a heterotroph? What is the name of the process that plants use to make their own food using energy from the sun?
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