Pumice is a volcanic rock that floats in water. the density of pumice compared with water is

What will be an ideal response?


less

Biology & Microbiology

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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

Biology & Microbiology

The retinoblastoma (Rb) protein controls progression into S phase by regulating ________ activity.

A) cyclin D B) p53 C) CDK4 D) E2F E) CDC28

Biology & Microbiology

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

Biology & Microbiology

A saprobe with a cell wall will utilize extracellular digestion.

Answer the following statement true (T) or false (F)

Biology & Microbiology