Some controversial evidence of hominin tools in China suggests that hominins may have left Africa as early as

A) 60,000 years ago.
B) 1 million years ago.
C) 2.1 million years ago.
D) 500,000 years ago.

The sodium chloride molecule breaks apart in water. What does "C" represent?

A) Chloride ion
B) Dissociation
C) Water molecule
D) Sodium ion
E) Salt crystal

Identify the correct sequence of the structures as they are involved in activity at a chemical synapse.

A) Postsynaptic membrane; synaptic cleft; presynaptic terminal
B) Presynaptic terminal; synaptic cleft; postsynaptic membrane
C) Synaptic cleft; presynaptic terminal; postsynaptic membrane
D) Presynaptic terminal; postsynaptic membrane; synaptic cleft

Which type of respiration rapidly produces ATP for short time periods?

A) Anaerobic respiration
B) Aerobic respiration
C) Both anaerobic respiration and aerobic respiration are correct.

A German _______________________________ is a workplace-level committee of employees granted codetermination, consultation and information rights and elected to represent all workers in dealings with management.

In the cell-mediated immune response, T cells secrete ________, which activate additional components of the immune system.

A) antibodies
B) complement
C) collagen
D) cytokines
E) histamine