Do molecules move down their concentration gradient

Select all of the answers that apply. examine the following rock strata. using the laws of biostratigraphy, which of the following statements are true about the relative ages of the rock layers and intrusion? intrusion a is older than all of the rock layers. layer b is older than intrusion a. layers c, d, and e are older than intrusion a. intrusion a is older than layers c, d, and e. without additional information, you cannot tell the relative ages of intrusion a and rock layers c, d, and e. layer b is older than layers c, d, and e.