Which of the following are the only extant animals that descended directly from dinosaurs?
A) lizards
B) crocodiles
C) birds
D) tuataras
C
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Two boys are on a camping trip and need birch bark to start their cooking fire. They cleanly remove a six-inch strip of bark from around the entire circumference of the trunk. Explain what eventually will happen to this tree
What will be an ideal response?
The basic unit of ecology is the individual because it
A) is the basis for ecosystems. B) is the unit on which natural selection acts. C) cannot be further reduced to smaller parts. D) passes genetic information to successive individuals.
Two STR loci were determined to have the following allele frequencies in the general population: STR A STR B Alleles: 1A: 0.1 1B: 0.4 2A: 0.55 2B: 0.4 3A: 0.25 3B: 0.2 4A: 0
1 A suspect in a criminal trial was genetically tested for these loci and was found to have the genotype (1A, 1A) for STR A and (2B, 2B) for STR B–homozygous for both loci. What is the probability that a randomly sampled person from this population would also have this genotype?
The water molecule is formed from two hydrogen atoms and one oxygen atom. Which type of force attracts one water molecule to another?
A) ionic bond B) hydrogen bond C) polar covalent bond D) nonpolar covalent bond