The feature that links birds to reptiles in evolution is the possession of
feathers
break
skeleton
scales
Countershading is an adaptive feature that enables animals to
fight enemies
remain undetected
warn enemies
attract mates
Which of the following plant structures lacks a waterproof cuticle?
leaf
stem
root
shoot
In the mammalian male reproductive system, the part that serves as a passage for both urine and semen is the
urethra
ureter
bladder
seminal vesicle
In plants which of the following is required in minute quantities for growth?
Copper
Potassium
Phosphorus
Sodium
