Scientists find a particle only visible with an electron microscope and is the shape of a soccer ball. the particle is non-cellular but has a dna core. the core is enclosed in a protein coat and the coat has spike-like projections all over its surface. this must be a

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.

Which layer will become saturated first when rain falls?

The transport tubes for food coming down the plants are called?