This is a preview. Log in through your library . Abstract Open circulatory systems have been portrayed aspoorly designed systems with poor performance characteristics, lacking in adequate tissue ...

The circulatory system of most spiders consists of the heart, pericardium, arterial vascular system, the open venous system, and lung veins connecting book lungs to the pericardium. Several important ...

The active ingredient in many insect repellents, deet, has been found to be toxic to the central nervous system. Researchers writing in the open access journal BMC Biology say that more investigations ...