A man drinks swamp water and later contracts malaria. This fact alone does not provide conclusive evidence that swamp water is responsible for causing malaria. To draw a valid conclusion, a experiment with only one factor is needed.

(first blank choices: controlled, scientific or dual)
(second blank choices: constant, variable or common)

d is the answer

sorry if its wrong!

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.