Compare and contrast placental mammals, marsupials, and monotremes. What will be an ideal response?
Monotremes lay eggs. Marsupial mammals deliver very premature young, which climb into a
protective pouch where they are further protected and nurtured. In placental mammals, the
development of the placenta allowed nutrients and oxygen to flow from the mother to the
embryo during development, and the young develop more fully before birth. Hence, when they
are born, placental mammal young generally are able to live independently.
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The world is divided into twenty different time zones
Indicate whether the statement is true or false.
The first cities appeared in
A) China. B) Egypt. C) the Indus Valley. D) Turkey and Iraq.
What are the major secondary pollutants, and how are they formed?
What will be an ideal response?
What is the term for a nutrient that is scarce in the environment and consequently controls biological growth?
A. Limiting nutrient B. Micronutrient C. Delimiting nutrient D. Macronutrient