1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Question: Which is NOT one of the four stages of development of some animals, especially the invertebrate insects. Egg, larvae, puppae, adult
Choices:
Egg
larvae
puppae
adult
youth
Question: Molecular data show that these invertebrates are at the base of the evolutionary tree of animals due in part because they lack true tissues, have few cell types and no nerve or muscle cells to speak of.
Choices:
sponges
trees
moss
moths
Question: There are______ amino acids that comprise proteins in the body and _____ of these are essential.
Choices:
10;20
15;10
20;9
25;5
Question: Animals are:
Choices:
heterotrophic
autotrophic
Question: Animals are:
Choices:
multi-cellular
single-cellular
Question: The diffusion of water molecules from a region of higher water concentration to a region of lower water concentration across a selectively permeable membrane is
Choices:
diffusion
osmosis
filtration
secretion
Question: Why does the larval (immature) form usually live in a different habitats and feed on different foods than the adult?
Choices:
To reduce competition so the adults and young do not compete for the same resources.
part because they lack true tissues, have few cell types and no nerve or muscle cells to speak of.
a fluid-filled capsule that contains a long, spirally coiled hollow thread. When triggered the nematocyst is discharged, some of which may trap prey while others have spines that penetrate and inject paralyzing toxins.
Question: When living things maintain an internal environment, it is termed:
Choices:
homeostasis
organizational
responsiveness
adaption
Question: There are fine hairlike bristles of
Choices:
Question: Animals are:
Choices:
prokaryotes
eukaryotes
Question: Animals are:
Choices:
prokaryotes
eukaryotes