Look at the food web
which organism would be at the top of the energy pyramid for this ecosystem?
a. wheat
b. snake
c. grass
d. hawk

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

What is one function of the embedded proteins

What characteristic makes a cell membrane selectively permeable