2) What describes the excretion of urea?
removal of
undigested
food
removal of
metabolic
wastes
removal of
substances
in excess
removal of
toxic products
А
X
X
✔
✔
B
X
✓
✔
✔
C
X
X
X
✔
D
✓
✔
✔
✔

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answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.