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.
The use of a simple dot matrix
simple squamous alveoli
Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his
A Simple Demonstration of Osmosis
The cochlear nerve fibers: The vestibulocochlear (VIII) nerve
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take