Which of the following factors defines a thermally direct cell?
A. It is driven by energy from the sun.
B. It occurs on both sides of a large lake or ocean.
C. It occurs in both the northern and southern hemispheres.
D. It involves heat.
Answer: A
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The fossil bird Archaeopteryx
A) suggests that birds and dinosaurs were designed to fit into different kinds of habitats and then placed there. B) had feathers, but not wings. C) is not a remnant of a living organism, but just an unusual rock formation. D) has characteristics that support the hypothesis that birds evolved from dinosaur ancestors.
When it is January and winter in the Northern Hemisphere, it is July and summer in the Southern
Hemisphere. Indicate whether the statement is true or false.
Organisms are composed of many elements. Which is the least abundant of these?
A)oxygen B)nitrogen C)calcium D)carbon E)hydrogen
Naturally occurring concentrations of some toxic elements, such as arsenic, may exceed both recommended "safe" levels and wastewater standards for industry.
Answer the following statement true (T) or false (F)