Which of the following is not true of the objective lens a there are three objective lens attached to the nose piece. b. the objective lens is easily rotate and do not need to be removed and replaced for use. c. there are three objective lens and each must be removed and replaced when needed

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!

Can someone give me the answers to this?