A seal has to breathe even if it is asleep. Martin observed a seal for one hour. At the start of his observation the seal dove to the bottom of the sea and started to sleep. In 8 minutes it slowly floated to the surface and took a breath. In 3 minutes it was back at the bottom of the sea again and the whole process started over in a very regular way. After one hour the seal was:

texas governor sam houston opposed secession, but was unable to prevent it. in this speech, given prior to lincoln's election, he presents the argument that slavery would be safer within the united states than outside of it. it was a prescient argument, and one held by several other southern leaders.

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explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long