A student collected the animal shown below on field trip. The student used a dichotomous key and a microscope to classify the animal. How should this animal be classified?

A. Arthropoda
B. Annelida
C. Mollusca
D. Platyhelminthes

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Linda and julia are trying to determine whether their ideas are scientific or pseudoscientific. linda's idea is free of bias. julia's idea gives the same result when tested repeatedly. which statement is correct about linda and julia's idea?

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.