An investigation was carried out to determine which of three antibacterial soaps is most effective. four petri dishes labeled a, b, c, and d were set up. the same amount and type of bacteria was added to each dish. next, 2 ml of a different brand of soap were added to dishes b, c, and d. then, 2 ml of water were added to dish a, instead of soap. the dishes were incubated at 37°c for 24 hours. at the end of the investigation, the amount of bacteria in each dish was determined. dish d had the least bacteria. it was concluded that the soap in dish d was the most effective soap to use against bacteria. which statement best describes the validity of this conclusion? the conclusion is not valid since the same amount of bacteria was used in each dish. the conclusion is valid since too small a sample of bacteria was used in this investigation. the conclusion is valid since the amounts of bacteria were measured at the end of the investigation. the conclusion might not be valid since the investigation was carried out only once.

Natalie had random hand movements when she was two months old. when she was six months old, she used to grab a block with her whole hand. now at the age of ten months, she can grasp the same block with her thumb and forefinger. this sequence of growth in her hand and finger movements is according to the pattern.

Chapter 11.1 & 11.2 notes section 11.1 1. every living thing has a set of ? inherited from its parents. 2. after becoming a ? , mendel spent several years studying ? and mathematics at the university of vienna. 3. during sexual reproduction, male and female reproductive cells join, a process known as ? . 4. pea flowers are normally ? , which means that sperm cells in pollen fertilize the egg cells in the ? flowers. 5. when mendel crossed plants with ? characters for the same trait, the resulting offspring had only one of the characters. 6. a ? is a specific characteristic, such as seed color or plant height, that varies from one individual to another. 7. filius and filia are the latin words for ? and ? . 8. the offspring of crosses between parents with different traits are called ? . 9.to mendel's surprise, all of the offspring had the character of only ? of the parents. 10. mendel's first conclusion was that biological inheritance is determined by ? that are ? from one generation to the next. 11. scientist calls the chemical factors that determine traits ? . 12. mendel's second conclusion is the ? . 13. the principle of dominance states that some alleles are ? and others are ? . 14. when mendel allowed the f1 plants to reproduce by self-pollination the traits controlled by ? alleles reappeared in about ? of the f2 plants in each cross.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?