One theory of human evolution suggests that Homo erectus evolved directly into Homo sapiens (humans), after which point Homo erectus became extinct. If this is true, humans arose by ______
A. cladogenesis
B. anagenesis
C. allopatric speciation
D. parapatric speciation
B
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Which of the following types of plankton can photosynthesize and produce its own food?
What will be an ideal response?
Infants require many nutrients early in life, including lipids such as fats. A low-fat diet for infants is not recommended because, among other things, it can affect the development of the nervous system
Why does the developing nervous system need lipids? A) Glial cells need lipids to produce the myelin sheath. B) Fats are needed for energy because infants are often on a low-carbohydrate diet. C) Lipids are needed to produce the polypeptide neurotransmitters used by neurons. D) Fats are required to generate action potentials on nerve cells.
The spinal cavity and cranial cavity are the two parts of the:
A) skeletal system. B) ventral cavity. C) dorsal cavity. D) abdominopelvic cavity.
Under certain circumstances, a person's resident flora can be opportunistic pathogens.
Answer the following statement true (T) or false (F)