Which of the following statements correctly describes a portion of the pine life cycle?
A) Female gametophytes use mitosis to produce eggs.
B) Seeds are produced in pollen-producing cones.
C) Pollen grains contain female gametophytes.
D) A pollen tube slowly digests its way through the triploid endosperm.
A
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Place the following events of parturition in the correct order.
(1) Stretch-sensitive neurons send signals to the hypothalamus. (2) Oxytocin receptors increase in the uterus. (3) Prostaglandin levels increase. (4) Estradiol levels increase. (5) Oxytocin levels increase. (6) Uterine muscles start to contract. A. 1,2,4,5,3,6 B. 4,2,1,5,6,3 C. 5,2,4,1,3,6 D. 1,6,4,2,5,3 E. 4,3,1,2,5,6
Background extinction rates eliminate approximately ____ species ____
a. 7-8; per 100 years b. 7-8; per 1000 years c. 7-8; per year d. 100; per year e. 100; per 1000 years
Chemical interaction competition in plants is called ________
Fill in the blank(s) with correct word
Schizophrenia and bipolar disorder are caused by _____
a. one gene, plus environmental triggers b. the same gene c. many genes, plus environmental triggers d. copy number variants, without environmental triggers e. the same mutations that cause autism spectrum disorders