Select the correct answer.
alex is conducting a survey for a car company. she decides to start by interviewing some people in her neighborhood. she prepares a questionnaire and emails it to 50 neighbors who own cars. of those neighbors, 24 respond. why is this sample likely to be biased?
a.
alex sent a questionnaire by email instead of going door to door.
b.
alex sent the questionnaire only to those who live near her.
c.
not everyone who got the questionnaire responded.
d.
those who got the questionnaire may not have responded on time.

15 points come and ! which characteristic describes all bacteria? a rod-shaped b microscopic c multicellular d autotrophic

What links the two strands in a dna helix together in the middle? a. phosphate groups b. sugar rings bonded together c. proteins d. bases with hydrogen bonds

Select all the correct answers. lactobacillus is a bacteria that live inside humans. these bacteria live on the nutrients from our bodies. they to keep our gut clean and healthy. s. typhi is a bacteria that enter our bodies through contaminated food. this bacteria causes infections in the body. based on this information, which two statements about the association between these bacteria and humans are true? a. lactobacillus shares a parasitic relationship with humans. b. s .typhi shares a parasitic relationship with humans. c. both lactobacillus and s. typhi share a parasitic relationship with humans. d. both lactobacillus and s. typhi share a mutualistic relationship with humans. e. lactobacillus shares a mutualistic relationship with humans, and s. typhi shares a parasitic relationship multiply chrse