A) eggs B) sperm C) cilia D) estrogens
A) vagina B) uterus C) ovary D) cervix
A) fertilization B) birth C) menstruation D) contraception
A) ovaries B) epididymis C) testes D) steroids
A) testosterone B) estrogen C) eggs D) sperm
A) epididymis B) cowper's gland C) vas deferens D) urethra
A) tri-weekly B) reproductive C) dizygomatic D) menstrual
A) fertilization B) menstruation C) ovarization D) ovulation
A) menstruation B) ovulation C) ovarization D) menestration
A) proteins B) semen C) ribosomes D) nuclei
A) one healthy sperm B) one super sperm C) one two-tailed sperm D) one fast sperm
A) ovum B) clone C) zygote D) spermatic cell
A) 8 B) 46 C) 23 D) 48
A) placenta B) uterus C) vagina D) umbilical cord
A) a lot B) sometimes C) rarely D) a little bit
A) uterus B) vagina C) umbilical cord D) placenta
A) vagina B) uterus C) oviduct D) placenta
A) clone B) ovum C) embryo D) sperm
A) steps B) stages C) processes D) sections
A) 9 weeks B) 9 months C) 9 stages D) 9 steps
A) mammalian B) humanid C) pregnant women D) humans
A) childhood B) adulthood C) infancy D) adolescence
A) Adolescence B) Later Years C) Childhood D) Adulthood
A) C → B → D → A B) A → B → C → D C) B → A → C → D D) D → B → C → A
A) 12 B) 26 C) 48 D) 6
A) placenta allows nutrients to diffuse from the mother to the embryo B) testis produces nutrients for the offspring C) uterus produces testosterone used in egg production D) ovary provides a place for the internal development of the embryo
A) Oak trees gradually become less common. B) The squirrel stops using its claws for digging. C) The squirrel is exposed to radiation for several days. D) The weather becomes wetter for a short period of time.
A) Their blood systems are separate, but certain materials pass from one to the other. B) Their blood systems are separate only at certain times in development and connected at other times. C) The blood flows directly from the mother into the fetus. D) Their blood systems are separate and no materials are exchanged.
A) genetic engineering B) asexual reproduction C) biotechnology D) meiotic cell division
A) cloned humans B) normal humans C) scientists D) enslaved humans
A) some of the sperm cells will survive to reach the egg. B) enough sperm cells will be present to transport the egg from where it is produced to where it develops into a fetus. C) at least one sperm cell will be reached when the eggs swim toward the sperm cells in the ovary. D) several sperm cells will unite with an egg so the fertilized egg will develop properly.
A) 2,500 per second B) 1,250 per second C) 1,000 per second D) 250 per second
A) estrogen B) progesterone C) testosterone D) insulin
A) sperm → zygote → organs → tissues B) zygote → tissues → organs → fetus C) fetus → tissues → zygote → egg D) zygote → sperm → tissues → egg
A) All cells have different genetic material. B) Developing cells may express different parts of their identical genetic instructions. C) Some cells develop before other cells. D) Mutations occur during development as a result of environmental conditions.
A) recombination of genes in gametes B) passive transport C) synthesis of proteins D) active transport
A) heredity B) immunity C) evolution D) differentiation
A) meiosis → fertilization → mitosis B) mitosis → fertilization → meiosis C) fertilization → mitosis → meiosis D) fertilization → meiosis → mitosis
A) progesterone and testosterone B) estrogen and insulin C) progesterone and estrogen D) testosterone and insulin
A) It removes waste products that are produced in the cells of the fetus. B) It synthesizes food for the embryo. C) It contains fluid that protects the embryo from harm. D) It allows blood of the mother to mix with the blood of the fetus. |