Which of the following is the stem cell needed to produce the male gamete?
a. Sperm
b. Spermatogonium
c. Primary spermatocyte
d. Secondary spermatocyte
b. Spermatogonium
The stem cell needed to produce the male gamete, sperm, is a spermatogonium.
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Larval oysters attach themselves to:
a. They do not have specific requirements. b. any available solid substrate. c. other oyster shells. d. both b and c e. sand.
How is salt extracted from the sea?
What will be an ideal response?
What mechanism is one that prevents fertilization due to reproductive times?
a. Behavioral isolation b. Anatomical isolation c. Habitat isolation d. Temporal isolation
Suppose you have many observations of the price of refrigerators, with other characteristics including their energy cost as well as whether or not they are stainless steel. Now, suppose you ran the standard linear regression of price on energy cost: Pricei = ?0 + ?1 Energy Costi + Ui and got an estimate of ?1. Now, suppose you know that stainless steel refrigerators are more popular (i.e., sell for higher prices holding all other characteristics constant) and tend to be in more energy efficient (i.e., lower energy cost) refrigerator models. What should you expect your estimate of ?1 in the following regression Pricei = ?0* + ?1*Energy Costi + ?2* Stainless Steeli + Ui to be?
A. ?1* > ?1 B. ?1* = ?1 C. ?1* < ?1 D. You cannot tell from the information given.