Jenny is comparing the reproductive structures of different species in the plant kingdom. Which structures would be most useful for determining angiosperms from gymnosperms?
needles and pollen
anthers and pistils
xylem and phloem
fruits and cones

fruits and cones

Explanation:

Higher plants are classified into two major groups namely: Angiosperm and Gymnosperm. These two groups of higher plants are vascular plants i.e. possess vascular tissues, that propagate by seeds.

The major difference between angiosperms and gymnosperms is that angiosperms bear that seeds in an enclosed structure called FRUITS, which develop from the ovary of a flower. Hence, they are called FLOWERING PLANTS. Gymnosperms, on the other hand, bear their seeds on naked structures called CONES.

Therefore, FRUITS AND CONES are the most useful structures from differentiating angiosperms from gymnosperms.

european union policies. the eu's long-term objective is to achieve levels of air quality that do not result in unacceptable impacts on, and risks to, human health and the environment. eu policies aim to reduce exposure to air pollution by reducing emissions and setting limits and target values for air quality.

the main environmental problems in western europe were: energy production/acid rain, nuclear power/waste, air pollution/climate, heavy metals, pesticides, water pollution, solid waste, and unforeseen accidents. many environmental problems are common to most european countries.

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."