Mrs. Canales pointed to an apple sitting on her desk. She asked her students to describe any forces acting
on the apple. This is what some of her stu-
dents said.
Archie: "The only force acting on the
apple is air pressure."
Sam: "There is one force acting on the apple. Gravity is the force that pulls on
the apple."
Soledad: "There are two forces: the desk pushes up on the apple and gravity pulls
downward on the apple."
Misha: "There are many forces acting on the apple; but, it is the holding force in the
apple that keeps it on the desk."
Tess: "There are no forces acting on the apple because the desk stops any forces
from acting on it."
Which student do you most agree with?

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

What function does the limb sever in each animal? how are the limb bones of the four animals similar? based on these similarities what can be inferred about the evolution of the four animals.

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia