An animal that can maintain a constant internal body temperature regardless of environmental changes is called
a. homotherm
b. cold-blooded
c. an endotherm
d. an ectotherm
c. an endotherm
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The small region of an inactivated X chromosome that is not inactivated contains ____________________ homologous to those on the Y chromosome
Fill in the blank(s) with correct word
Double fertilization in flowering plants refers to ________
a. two sperm fertilizing a single egg b. two sperm fertilizing two eggs c. a single sperm fertilizing two eggs d. a sperm fertilizing an egg and another sperm fertilizing the endosperm mother cell
An individual whose sex chromosome complement is XXY has ________ Barr body/bodies in their cells
Fill in the blank with correct word.
What characteristic is unique to echinoderms?
A) a lack of segmentation B) a water vascular system C) radial symmetry D) larvae with bilateral symmetry