Pumice is a volcanic rock that floats in water. the density of pumice compared with water is
What will be an ideal response?
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The chorionic villi eventually form the placenta, a disc-shaped structure that ____
a. releases sex hormones at appropriate times throughout pregnancy b. initiates uterine contractions c. binds to the zygote to accelerate organ development d. nourishes the embryo throughout pregnancy e. prevents infection by blocking the passage of microorganisms through the cervix during pregnancy
The retinoblastoma (Rb) protein controls progression into S phase by regulating ________ activity.
A) cyclin D B) p53 C) CDK4 D) E2F E) CDC28
When erythrocytes are old or die, how are they removed from the blood stream?
a. the liver filters them out b. they break up into small particles and are cleared out by the kidneys. c. they dissolve into liquid and circulate in that form in the blood d. they are attacked by macrophages and removed e. they stay as intact dead cells and are filtered out by the kidneys
A saprobe with a cell wall will utilize extracellular digestion.
Answer the following statement true (T) or false (F)