A species of cactus has spines. How would biologists explain how a species of cactus with spines evolved from an ancestral cactus species without spines?

The ability to build and use watercraft probably evolved very late in homo sapiens evolutionary history, and was certainly not part of an early archaic homo sapiens toolkit.

Which best describes the flow of genetic information? A. Protein to DNA to RNA B. Protein to RNA to DNA C. DNA to RNA to protein D. RNA to DNA to protein

Which of the following animals is most likely to have an open circulatory system? A. lizard B. bird C. dog D. crab

One of the most unusual aspects of virus particles is the absence of all organelles and other smaller structures.

1. Which cells form the stomata? A. sieve cells B. guard cells C. phloem cells D. mesophyll cells 2. What is the first structure to prevent water loss in the leaf called? A. cuticle B. stomata C. epidermis D. mesophyll 3.

Which of the following statements about internal membranes in eukaryotic cells is false? a. In eukaryotic cells, internal membranes standardize the internal environment of all cellular organelles. b.

What is the net production of ATP, per molecule of glucose during the fermentation of glucose to lactate? A. 36 molecules B. 4 molecules C. 2 molecules D. None

When a child is born with a chromosomal mutation, when aid he mutation occur? O A. During transcription O B. During translation 04. Durine meiosis During mit is

A desert would be an example of what type of climate? dry climate mild climate continental climate mountain area tropical climate

In the "analyzing the problem" step in the problem solving process, one should evaluate the causes, effects, and symptoms of the problem.