Answer the following question given this paragraph: Negative electrons are attracted to positive protons, and this electric force keeps electrons moving about the nucleus. The force of attraction between protons and neutrons, called the strong force, holds the nucleus together. Q: What are negative electrons attracted to? Choices: - hormones - ions - neutral electrons - positive protons A:
positive protons

Answer the following question given this paragraph: Mechanical weathering breaks rock into smaller pieces. These smaller pieces are just like the bigger rock; they're just smaller! The rock has broken without changing its composition. The smaller pieces have the same minerals in the same proportions. You could use the expression "a chip off the old block" to describe mechanical weathering! The main agents of mechanical weathering are water, ice, and wind. Q: What type of weathering breaks rock into smaller pieces? Choices: - fluid weathering - chemical erosion - chemical weathering - mechanical weathering A:
mechanical weathering

Answer the following question given this paragraph: Puberty is the stage of life when a child becomes sexually mature. Puberty lasts from about 10 to 16 years of age in girls and from about 12 to 18 years of age in boys. In both girls and boys, puberty begins when the pituitary gland signals the gonads (ovaries or testes) to start secreting sex hormones (estrogen in girls, testosterone in boys). Sex hormones, in turn, cause many other changes to take place. Q: What is the name of the stage of life when a child becomes sexually mature? Choices: - adolescence - growth spurt - maturity - puberty A:
puberty

Answer the following question given this paragraph: 43.7 Organogenesis and Vertebrate Formation Organogenesis is the formation of organs from the germ layers. Each germ layer gives rise to specific tissue types. The first stage is the formation of the neural system in the ectoderm. The mesoderm gives rise to somites and the notochord. Formation of vertebrate axis is another important developmental stage. Q: What is the formation of organs from the germ layers called? Choices: - photosynthesis - synaptogenesis - biosynthesis - organogenesis A:
organogenesis