To reiterate instructions a. mediae on b. confuse c. explain d. repeat e. revise

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.

What best explains the inability for life to exist in earth early atmosphere

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient