Which include the male and female sex cells?

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

What type of plant is good for a bioassay and where can i buy it? i only have a month.