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 basalt below the hominins is dated to 1.8 million years ago, and the geomagnetic polarity of the
Cranial capacity has increased approximately fourfold over the last 3.5 million years of hominin evo
Review Cognitive Changes over the Adult Years
Longevity in Animals
Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050.
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take