The earliest cells were probably autotrophs that made food by photosynthesis

a. true
b. false


Answer: b. false

Biology & Microbiology

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Most invasive species have a far greater impact in their new home than they did in the community in which they evolved. Why is this?

What will be an ideal response?

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The sieve plate, stone canal, circular canal, and radial canals of a sea star are structures of the

a. nervous system. b. water-vascular system. c. digestive system. d. excretory system.

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Identify the structure that does NOT have a double membrane protecting it.

A) nucleus B) chloroplast C) mitochondria D) ribosome

Biology & Microbiology

Excitatory neurotransmitters are most like what part of an automobile?

A) brakes B) windshield wiper C) accelerator D) horn

Biology & Microbiology