Which of the following can be used by scientists to date the sediment layer they are found in? select all that apply. a) fossils b) tree rings c) animal growth rings d) radioactive isotopes e) mineral elements

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

1) strawberry plants typically reproduce by making runners, which are miniature versions of themselves, that grow off of the roots and stems of the parent. this type of vegetative reproduction is known as a) pollination. b) fragmentation. c) binary fission. d) vegetative propogation.

Were you able to observe the nucleolus in any of the cells if so which ones