The zebra mussel, a mollusk native to eurasia, was first discovered in the great lakes of north america in 1988. zebra mussels attach to solid substrates and are filter feeders. adult zebra mussels can survive for several days or even weeks out of water if the temperature and humidity are favorable. an adult female zebra mussel can produce as many as one million eggs per year. the recent range of occurrence of zebra mussels in the united states is indicated by shading in the map below. special note* a filter feed eats by taking in water and "filtering it" then pushing it out the other side, the filter in the mussel then traps any food particles in the water. this type of feeding tends to make the water very clear because it traps sediment as well.

Schools are being forced to embrace computers. unlike their "digital immigrant" teachers, these students are "digital natives", born into a world where technology is an integral part of everyday life. almost every student has access to a multitude of computers, laptops and tablet devices. it would be crazy to assume an assignment would  notbe written on computer in this day and age.many schools now have a 1-to-1 computer policy, and many districts and states in the united states have mandated computers or ipads across the state for every student,  including los angeles, the second largest school district in the country.but the thing is, when they tried it in la, it wasn't the success they hoped for. that's because the tablets weren't used as much as they expected. rather, it appeared there was a gap between the digital native's love of technology and their use of it in the classroom.this conflicted relationship with computers is also underscored by much of the literature on education. it is also highlighted in professional development and conferences such as  edutech.

The salt in the sea water dehydrated the sailor because her body could not take in the amount to salt in the sea water