In flatworms, the ____ is/are used to gather food
a. nephridia
b. contractile vacuoles
c. Malpighian tubules
d. pharynx
e. flame cells
ANSWER: d
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Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. How many different types of amino acids are used to construct proteins?
A. 2 B. 20 C. 146 D. 200
Adaptations that evolved in the group of animals called the _____ have allowed them to complete their life cycles entirely on land
Fill in the blank(s) with the appropriate word(s).
Which of the following statements regarding the loss of biodiversity is false?
A. Earth is losing 2.5% of its species annually. B. There will be fewer species at the end of the 21st century than there are now. C. Loss of biodiversity results in the loss of novel compounds with potential medical applications. D. Loss of biodiversity may result in less productive and resilient communities. E. Habitat degradation is one of the most important threats to biodiversity.
Which of the following substances is secreted by an endocrine gland?
a. Tears b. Breast milk c. Wax d. Saliva e. Hormones