Which condition is necessary for a mold fossil to form? The fossil must be preserved in amber.
Minerals must replace the remains.
The mold must be filled with sediment.
Hard parts of the organism must dissolve.

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days. true or false

Name the process by which soil is formed from rocks? ?