Mantle plumes are areas of hot, upwelling mantle and hot spots develops above these plumes as noted in the map above. magma generated by the hot spot rises through the rigid plates of the lithosphere and produces active volcanoes at the earth's surface. as oceanic volcanoes move away from the hot spot, they cool and subside, producing islands, atolls, and seamounts. as the magma cools in the water it forms rocks. a) metamorphic b) clastic igneous c) extrusive igneous d) intrusive igneous

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

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.