Four of these characteristics describing a species play a role in phylogeny. Which one does not?
A. Number of digits
B. DNA sequence for a gene
C. Amino acid sequence of an enzyme
D. Number of petals
E. Number of individuals
Answer: E
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Which anterior pituitary hormone triggers ovulation?
a. GnRH b. estrogen c. progesterone d. FSH e. LH
The patchwork of different types of land cover is called a(n) ________
Fill in the blank(s) with correct word
The hormone that controls the milk letdown reflex is:
A) estrogen B) luteinizing hormone C) oxytocin D) follicle-stimulating hormone
What is the main way that sharks and rays deal with the osmotic stress of living in seawater?
a. by active transport of ions out of the body by chloride cells b. by maintaining high levels of urea and trimethylamine oxide in body fluids c. by active transport of ions into the body through the gills d. by excreting nitrogenous wastes through their kidneys as urea