________ formed the semipermeable membrane-like surfaces for the earliest life forms
A) Proteins
B) Hydrogen sulfide
C) Lipid bilayers
D) RNA
Answer: C
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Which of the following organelles plays an important role in phagocytosis (a type of endocytosis), contains a variety of digestive enzymes, and has transport pumps that maintain an acidic pH inside the organelle?
a) lysosomes b) Golgi complex c) peroxisomes d) mitochondria e) proteasomes
Boundaries offer unique habitats
A) that offer relatively easy access to adjacent communities. B) that do not offer easy access to adjacent communities. C) that support only species specially adapted to the boundary environment. D) whose composition is almost exactly the same as adjacent communities.
Homo sapiens have existed on earth for 2% of the earth's history.
Answer the following statement true (T) or false (F)
In ________ countries, the doubling time is often small
Fill in the blank(s) with correct word