Which of the following would increase the rate of heat exchange between an animal and its environment?

a) blubber or fat layer
b) feathers or fur
c) vasoconstriction
d) countercurrent heat exchanger
e) wind blowing across the body surface

E

Explanation:

Wind blowing across the body surface increases transpiration of the skin. The winds reduce the local air pressure above the skin allowing the sweat to evaporate faster. As the sweat evaporates, it carries with it heat from the body. This cools the skin much faster than on a non-windy day. This is why a breeze feels so cool on the human skin on a hot day.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation: