Two body systems work together to help remove waste products from blood. Whatare these two systems? a. Respiratory and excretory
b. skeletal and digestive
c. circulatory and reproductive
d. nervous and excretory

Ectocarpene is a volatile, sperm cell-attracting material released by the eggs of the seaweed ectocarpus siliculosus. its constitution is all the double bonds are cis, and the absolute configuration of the chirality center is s. draw a stereochemically accurate representation of ectocarpene.

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite