The stalk of a leaf is called the ________.

Fill in the blank(s) with the appropriate word(s).


petiole

The stalk of a leaf is called the petiole.

Biology & Microbiology

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For water fleas of the genus Daphnia, switching from a pattern of asexual reproduction to sexual reproduction coincides with _____

A) environmental conditions becoming more favorable for offspring B) greater abundance of food resources for offspring C) periods of temperature or food stresses on adults D) completion of puberty E) exhaustion of an individual's supply of eggs

Biology & Microbiology

In a frog embryo, gastrulation

A. produces a blastocoel displaced into the animal hemisphere. B. occurs along the primitive streak in the animal hemisphere. C. is impossible because of the large amount of yolk in the egg. D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore. E. occurs within the inner cell mass that is embedded in the large amount of yolk.

Biology & Microbiology

There are still many unanswered questions about evolution

Indicate whether the statement is true or false.

Biology & Microbiology

When r = 0.00001, the population size:a

will increase. b. will decrease. c. is stable. d. may increase or decrease, depending on K. e. may increase or decrease, depending on i.

Biology & Microbiology