Out of the 200500 million sperm cells that are released during an ejaculation, only ____ complete the short journey up the Fallopian tubes to where an egg is waiting to be fertilized.
a. half
b. a few thousand
c. a few hundred
d. a few hundred thousand
Question 2
In the study by Kobayashi-Winata and Power (1991), were there any differences in the childrearing techniques of middle-class parents from Japan and America?
a. In both cases, parents used high amounts of punishment.
b. Japanese parents were higher in control and lower in warmth.
c. American parents were low in control and low in warmth.
d. American parents relied on external punishments, such as sending a child to his/her room, whereas Japaneseparents used more verbal comments, explanations and reprimands.
Looking at Cells
Electron-micrograph of human sperm.
Intracytoplasmic sperm injection (ICSI).
Adenosine triphosphate (ATP) is the most common molecule used by cells to captur
Hematopoiesis: Blood cells are formed from stem cells under the influence of hormones such as ...
In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig