36. The type of symbiosis in which both species benefit is called .
37. The type of symbiosis in which one organism benefits while the other is unaffected is called .
38. The type of symbiosis in which one organism is helped and the other is harmed is called .
39. Those protozoans that are nonmotile are usually .
40. are simple, water-dwelling organisms that make their food by photosynthesis.
41. Algae may be found in long chain-like or grouped in .
42. All algae contain the green pigment .
43. Brown algae are in the phylum .
44. Different-shaped gametes are called .
45. Euglenoids are in the phylum .
46. Fire algae are in the phylum .
47. Golden algae are in the phylum .
48. Green algae are in the phylum .
49. Red algae are a source of , the jelly-like medium upon which we grow bacteria.
50. Red algae are in the phylum .
51. Sexual reproduction occurs when specialized sex cells called join to form zygotes.
52. Similar gametes are called .
53. Swimming spores are called .
54. The algae called can be used as abrasive in scouring powders and polishes.
55. The algae whose walls are composed of pectin and silica which makes a glass-like shell are called .
56. The body of an alga is called a .
57. The chemical, , which is extracted from algae is used as a thickener in chocolate milk, jams, jellies, ice cream, and salad dressings.
58. The group of algae that can cause problems with smell or taste is the phylum .
59. The group of algae that cause "red tide" are the .
60. The largest and best-known seaweed is called .
61. The most widely distributed algae are the .
62. The orange pigments in algae are called .
63. The production of light by living things is called .
64. The structure that holds seaweed to the bottom is called a .
65. The thallus lacks specialized organs such as roots, , or leaves.
66. The type of algae that has spiral chloroplasts is called .
67. Which group includes many of the seaweeds.
68. Which type of algae are used in scouring powders?