At Halloween, Gregory puts on a scary mask that makes him look like a zombie. His 3-year-old brother Dennis is petrified, believing that Gregory has become a zombie. Dennis has not yet mastered the concept of
A) classification.
B) conservation.
C) representation.
D) reversibility.
Question 2
Three-year-old Ceres is playing with her toy farm. She has 15 cows, 3 pigs, and 2 horses. When her older brother asks whether there are more cows or more animals, she happily yells out, more cows Ceres has not yet mastered the concept of
A) classification.
B) conservation.
C) representation.
D) reversibility.
The nitrogen cycle. Numbers represent fluxes as 1012 g N per year (data from Schlesinger 1991, after
Rate of Residential Change, Past Year, in the United States
The mask covers both the mouth and nose to prevent exposure to body fluids and airborne droplets.
Types of ecosystem service vs. total global value per year
Foods for Baby’s First Year
Chinese new year 2023