Which hormone results in the production of more neurons in the higher vocal center of the brains of male, but not
female, zebra finches?
a. testosterone
b. estrogen
c. octopamine
d. epinephrine
e. androgen
ANSWER: b
You might also like to view...
Which of the following is the defining characteristic of the gymnosperms?
a. needle leaves b. small female and large male cones c. naked seeds d. pollination by insects
The Cambrian Explosion provided a wealth of fossil remains for scientists to uncover. Many of the animals from this time period had tough skins or shells. This would
a. protect the animal from osmotic pressure. b. be a disadvantage for these organisms and lead to their death and fossil formation. c. protect the animal from predators. d. make these animals more desirable to predators. e. allow the animals to move into different environments easily.
In your garden, you have an Ailanthus altissima, also known as the Tree-of-Heaven. You try adding additional plants to the same garden bed, but notice poor seed germination and seedling growth around the tree. What is the most likely explanation for this?
A. The tree is utilizing most of the available miconutrients in the soil. B. The tree is blocking most of the available sunlight which is limiting germination and growth. C. The tree is releasing chemicals into the soil that are inhibiting germination and growth of other plants. D. The tree has a mutalistic relationship with animals that are removing plants that are in competition for resources with the tree. E. The roots of the tree have a stronger water potential than the seedlings which is causing the seedlings to dehydrate.
Complete the analogy: ________ is/are to birds as ________ is/are to mammals
A) Wings; legs B) Water; milk C) Feathers; hair D) Wings; opposable thumbs