From what point of view is this passage written?

If you were testing the effectiveness of a cream that reduced the signs of wrinkles around women's eyes, which of the following would be a good control group?

A blouse normally sells for $138, but is on sale for 25% off. What is the cost of the blouse?

Peter the Great's reign was dominated by his efforts to

Which list is in the correct chronological order?

Mary Ainsworth described three major categories of infant attachment: secure, anxious/avoidant, and anxious/ambivalent. After years of additional research by many investigators, Mary Main and Judith Solomon in 1986 identified a fourth pattern: anxious/disorganized/disoriented. These four major patterns of attachment describe unique sets of behavior: Secure: Securely attached babies are able to use the attachment figure as an effective secure base from which to explore the world. When such moderately stressful events as brief (3-minute) separations in an unfamiliar environment occur, these securely attached babies approach or signal to the attachment figure at reunion and achieve a degree of proximity or contact which suffices to terminate attachment behavior. They accomplish this with little or no open or masked anger, and soon return to exploration or play. Avoidant: Babies with avoidant attachments are covertly anxious about the attachment figure�s responsiveness and have developed a defensive strategy for managing their anxiety. Upon the attachment figure�s return after the same moderately stressful events, these avoidant babies show mild version of the �detachment� behavior which characterizes many infants after separations of two or three weeks; that is, they fail to greet the mother, ignore her overtures and act as if she is of little importance. Ambivalent: In babies with anxious/ambivalent attachments, both anxiety and mixed feelings about the attachment figure are readily observable. At reunion after brief separations in an unfamiliar environment, they mingle openly angry behavior with their attachment behavior. Disorganized/Disoriented: Babies classified in this group appear to have no consistent strategy for managing separation from and reunion with the attachment figure. Some appear to be clinically depressed; some demonstrate mixtures of avoidant behavior, openly angry behavior and attachment behavior. Others show odd, often uncomfortable and disturbing behaviors. These infant are often seen in studies of high-risk samples of severely maltreated, very disturbed or depressed babies, but also appear in normal middle-class samples. (U.S. Department of Health and Human Services) It can be inferred from this passage that Mary Ainsworth is a

This passage is mainly about

The major advantage of sexual reproduction over asexual forms is that

Isotopes The nucleus of an atom contains both protons and neutrons. Protons have a single positive electric charge, while neutrons have a charge of zero. The number of protons that a nucleus contains, called the atomic number and abbreviated as Z, determines the identity of an atom of matter. For example, hydrogen contains a single proton (Z =1), whereas helium contains two (Z = 2). Atoms of a single element may differ in terms of the number of neutrons in their atomic nuclei, however. The total number of protons and neutrons in an atom is referred to as the atomic mass, or M. Helium typically has an atomic mass equal to 4, but there is another helium isotope for which M = 3. This form of helium has the same number of protons, but only one neutron. In an atomic fusion reaction, nuclei collide with one another with enough force to break them apart. The resulting nuclei may have a lower atomic mass than the reactants, with the difference being released as energy. Electric charge, however, is always conserved. Two atoms of helium-3 (atomic mass = 3) collide in a fusion reaction to produce a single atom of helium-4 (atomic mass = 4). What might be another product of this reaction?

Hydrogen atoms usually contain a single neutron. Deuterium and tritium are isotopes of hydrogen containing two or three neutrons, respectively. How many electrons orbit the tritium nucleus if the atom is electrically neutral?