In __________, one of the sperm cells in the pollen tube fertilizes the egg, forming a zygote; the other
fuses with the endosperm mother cell and gives rise to __________. Fill in the blank(s) with the appropriate word(s).
double fertilization; endosperm
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The method that indicates the age of a substance by measuring the relative content of a radioisotope and its daughter
elements is called ____ dating.
a. fossil b. radiometric c. isotope d. zircon e. uranium
Migrating cells move around the developing embryo using ____
a. electrical signals b. genetic markers c. apoptosis d. adhesive cues e. osmosis gradients
The enzyme found in tears that can digest bacterial cell walls is called:a
protease. b. lysozyme. c. interferon. d. cytokine. e. defensin.
The most successful mammals belong to the marsupials group.
Answer the following statement true (T) or false (F)