What type of process wears away pieces of sediment from rock ?

mechanical weathering breaks rocks into smaller pieces without changing their composition. ice wedging and abrasion are two important processes of mechanical weathering. chemical weathering breaks down rocks by forming new minerals that are stable at the earth's surface.

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.