What is a trace fossil?
A. a small fossil
B. fossil evidence of organisms other than
conventional fossils of hard body parts
C. a fossil which is part of a series of fossils
that trace the evolution of a group of species
D. a fossil that allows scientists to trace the
movement of the fossilized organism
B
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Answer the following statements true (T) or false (F)
1. The ecological footprint of an average Egyptian is greater than that of an average American. 2. Random dispersion is rare compared to clumped dispersion. 3. Humans are iteroparous. 4. Demography is the study of how births and deaths change population sizes over time. 5. Modern humans show a type I survivorship curve.
Deforestation results in
a. increased air temperatures. b. decreased soil fertility. c. decreased transpiration rates of individual plants. d. increased air temperatures and decreased soil fertility. e. increased air temperatures, decreased soil fertility, and decreased transpiration rates of individual plants.
The broad-sense heritability of a trait is estimated at 0.8. If the total phenotypic variance is estimated at 32.20, what is the genetic variance?
What will be an ideal response?
Which of the following statements correctly explains what it means for DNA replication to be bidirectional?
(a) The replication fork can open or close, depending on the conditions. (b) The DNA replication machinery can move in either direction on the template strand. (c) Replication-fork movement can switch directions when the fork converges on another replication fork. (d) The replication forks formed at the origin move in opposite directions.