Whatever their specialty, marine biologists must have knowledge in biology, chemistry, physics, geology, and ecology. They need active learning and listening, critical thinking, complex problem solving, speaking, and writing skills.
Here's the lowdown: Flea collars do kill fleas. However they do it slowly. It takes about 4 days for a flea collar to kill a flea. In that amount of time, the flea has laid about 400 eggs. Then mom and dad flea die.Now 2 weeks later 400 newly hatched fleas jump onto Fido or Mittens. The flea collar again kills the newly acquired fleas....in another 4 days.ere's the lowdown: Flea collars do kill fleas. However they do it slowly. It takes about 4 days for a flea collar to kill a flea. In that amount of time, the flea has laid about 400 eggs. Then mom and dad flea die.
Best Answer: How quickly flea eggs hatch depends on humidity. It can take anywhere between 2 days and 2 weeks. Frontline is a good quality effective flea treatment, available from your vets.Generally, shop bought flea treatments are next to useless and should be avoided.t can take anywhere between 2 days and 2 weeks. Frontline is a good quality effective flea treatment, available from your vets. Generally, shop bought flea treatments are next to useless and should be avoided.