Why would a breeder of pack animals such as dogs be interested in discouraging synchronized heat in the breeding females?
What will be an ideal response?
Small animal breeders do not have the management personnel that livestock producers have. For small animal breeders, it is better to have animals give birth singly to provide maximal care to the mothers and their offspring. Also, synchronized heat cycles can trigger pack behaviors, such as the submissive female absorbing a litter if bred at the same time as the dominant female in the pack.
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Which epithelial tissue is found lining the lumen of the stomach and small intestine?
A. Simple cuboidal epithelium B. Simple columnar epithelium C. Pseudostratified columnar epithelium D. Transitional epithelium E. Stratified squamous epithelium
Which statement is true about T cells?
A) They will develop into cytotoxic T cells if antigen is complexed with class II MHC proteins. B) Once activated, they cannot secrete cytokines. C) Their proliferation is enhanced by interleukins 1 and 2. D) They usually directly recognize antigens, which then activates a subpopulation of killer cells.
Which of the following have capillaries which are part of a portal system?
a. liver b. pituitary c. hypothalamus d. liver, pituitary, and hypothalamus e. pituitary and hypothalamus
In the phrase "nature vs. nurture", the word nurture refers to __________________:
a. characteristics you inherit b. environmental factors such as culture, education and experience c. the genetic characteristics you receive from your mother d. the role of DNA in shaping your behavior