This animal has the fewest genes, the simplest
body plan, and only four cell types. It is a
a. planarian.
b. placozoan.
c. annelid.
d. roundworm.
e. sponge
A
You might also like to view...
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
Four of the five answers are characteristics of diatoms. Select the exception
a. two-part silica shells b. photosynthetic c. some produce a toxin that accumulates in fish, crabs, and shellfish d. flagella e. live in lakes, seas, and damp soils
Eggs are transported to the uterus by the ____________ tubes.
Fill in the blank(s) with the appropriate word(s)
Answer the following questions true (T) or false (F)
1. If an Rh-positive woman marries an Rh-negative man, their children are at risk for hemolytic disease of the newborn. 2. Infection with certain viruses may lead to the development of type I diabetes. 3. Depletion of the helper T cell population by HIV results in the development of AIDS.