Only male frog produce croacking sound because: A) Female frog have no larynx
B) Female frog have larynx but no vocal cord
C) Male frog have three pair of vocal cord
D) Male frog can magnify their voice with the help of sound box

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.