Mutations of the brac1 gene in egg cells lead to breast cancer

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Using meiosis, the sporophyte produces spores that are .