Ecciona la mejor contestación: 1. ¿Qué son las ciencias ambientales?
a. Ciencia que estudia la vida - c. Ciencia que estudia el ambiente
b. Ciencia que estudia la energía d. Ciencia que estudia la materia
2. ¿Qué tipo de contaminación puede afectar los cultivos?
a. Contaminación de suelo
c. Contaminación de agua
b. Contaminación de sonido d. A y C son correctas
3. ¿Cuándo se estableció el Clean Air Act?
a. 1990
C. 1890
b. 2000
d. 1970
1. Cuál es la capa que se afecta por CFCs?
a. Aceite
C. Plástico
b. Ozono
d. Ninguna
6. ¿Qué pez es una plaga en el Caribe?
a Dorado
b. Pez León
c. Pez gato
d. Marlin

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:

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

"a.) well–developed vascular system."