Which of these must occur during S phase of the cell cycle so that two daughter cells can
be produced during M phase?
A.
The DNA must be replicated.
The chromosomes must be joined.
The cytoplasm must be separated.
The cell membrane must be expanded.

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos

Me.henley said, “in the rat race we call life, only the strong will survive.” he may have been referring to

Mattias scheiden and theodor schwann studied plant and aniaml cells under a microscope.together these men concluded that plants and aniamals are made up of cells, which scientist furthered their study to complete our mordern cell theory