Phosphorus is needed by organisms for
A. DNA.
B. bones.
C. cell membranes.
D. All of these answers are correct.
D. All of these answers are correct.
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The test tubes in the photograph contain Benedict’s solution and two unknown substances that have been heated. What do the results indicate for each substance?
What will be an ideal response?
Cuticle, guard cells, stomata, and trichomes are all terms associated with ____
a. ground tissue b. vascular tissue c. meristem d. dermal tissue e. secondary tissue
Why are fossils older than 60 000 years hard to date using C14? What will be an ideal response?
The undifferentiated genitalia of an early human embryo develops into male genitalia under the influence of ____
a. oxytocin b. prostaglandin and DHT c. prolactin d. testosterone, AMH, and DHT e. Wolfian duct inhibitors