Enveloped viruses may enter their host cells by engulfment within coated vesicles (endocytosis).
Answer the following statement true (T) or false (F)
True
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When you compare Australian marsupials to placental mammals today
Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.
A. the marsupials are all very primitive, having changed very little during the last 70 million years.
B. the marsupials are very similar to placental mammals in the ways they have adapted to similar ecological niches.
C. the marsupials have evolved much more rapidly than placental mammals and are more highly adapted.
D. the marsupial fossils look remarkably similar to the placental mammals of today.
E. living marsupials are little changed from the earliest marsupial fossil forms.
Intracytoplasmic sperm injection (ICSI) is used by couples in which the _____
a. female has blocked oviducts b. female has very irregular ovulation c. female is approaching menopause d. source of sperm is a sperm bank e. male is infertile
Transpiration results from
a. the polar nature of water molecules. b. the drying power of air. c. cohesion-tension forces. d. photosynthesis. e. all of these.
What is a more accurate description for the secondhand smoke emitted by a lit cigarette combined with the smoke exhaled by active smokers?
A) passive smoke B) environmental tobacco smoke C) active smoke D) dirty air