This is a canyon in Iceland. How did it most likely form. A) Plant roots weathered soft rock, turning it to soil. B) Gravity caused sediment to erode upstream. C) Flowing water weathered and eroded the riverbed. D) Blowing wind deposited sediments on the riverbank.

Which of the following lines of evidence would best support your assertion that a particular plant is an angiosperm? a) it produces seeds. b) it retains its fertilized egg within its archaegonium. c) it lacks gametangia. d) it undergoes alternation of generations.

This is the diveristy of ecosystems natural communites and habits it is the variety of ways that species interact with each other and their environment

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.