Images Dated 31st October 2003

Watercolour artwork of the protozoan, Euglena sp

Euglena sp. Watercolour artwork of the pond- dwelling Euglena sp., a protozoan. This single- celled organism has a tail-like flagellum for locomotion (at centre left), attached within the reservoir (light green oval, at centre left). A contractile vacuole (blue) maintains the water balance by expelling fluid from the reservoir. Below is a stigma, or eye spot (red), for locating light for photosynthesis. The cytoplasm is green due to the large number of photosynthetic chloroplasts that form starch using sunlight. This food is stored in paramylum granules (purple spheres). The large nucleus (purple, at upper right) contains genetic material

© LIZZIE HARPER/SCIENCE PHOTO LIBRARY

Sojourner on the surface of Mars

Sojourner. Mars Pathfinder mosaic image of the robotic Sojourner vehicle on the surface of Mars near the rock known as "Barnacle Bill" (at centre left). "Barnacle Bill" was the first rock to be studied by Sojourner with its Alpha-Proton X-Ray Spectrometer (APXS). Sojourner also carries a high-resolution camera to study rocks. The rover weighs about 9 kilogrammes, is 63 centimetres (cm) long and 48cm wide. It is powered by a solar panel which will allow for a few hours movement per day, and is controlled by an operator on Earth. Image taken by the Imager for Mars Pathfinder (IMP) on the third Martian day (Sol 3) that it spent on Mars since it landed on 4 July 1997

© NASA/SCIENCE PHOTO LIBRARY

Black Bear climbing Tree (Ursus americanus), IC, MT, Montana

© Greenberg, Phyllis / Animals Animals/Earth Scenes

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