The first animals with simple nerve nets probably evolved about _________ years ago.
a. 4.5 billion
b. 3.5 billion
c. 700 million
d. 250 million
Question 2
Natural selection refers to the
a. ability of farmers and breeders to develop animals with specific traits, such as fast horses and hairless Chihuahuas.
b. ability to select embryos with certain characteristics during in vitro fertilization.
c. success of one trait over another in the survival of a species.
d. dominance of genes for one trait, such as dark eye color, over another, such as blue eye color.
phylogenetic tree of animals
Ngandong calottes from Java are the youngest H. erectus fossils at perhaps 27,000-50,000 years old.
In pretend play, toy figures and animals “come to life” and interact with each other.
Stepwise approach for managing asthma in adults and patients 12 years and older.
The two main types of nerve cells.
Testing motor function of cranial nerve VII - Frown