The cycads, a mostly tropical phylum of gymnosperms, evolved about 300 million years ago and were dominant forms during the age of the dinosaurs. though their sperm are flagellated, their ovules are pollinated by beetles. these beetles get nutrition from the pollen and shelter from the microsporophylls. upon visiting megasporophylls, the beatles transfer pollen to the exposed ovules. in cycads, pollen cones and seed cones are borne on different plants. cycads synthesize neurotoxins, especially in the seeds, that are effective against most animals, including humans. which feature of cycads distinguishes them from most other gymnosperms
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Biology, 22.06.2019 03:20, ahmedeldyame
Which of the following statements most accurately describes convergent evolution? the process in which two similar species evolve separately from each other and share similar characteristics the process in which a single species evolves into two or more new species the process in which two entirely different species evolve in response to each other the process in which two different species evolve separately from each other but still share similar characteristics
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Biology, 22.06.2019 05:00, kamnicole13
Idon’t know the answer and i’ve been stuck on it for a while now skskskskks
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Biology, 22.06.2019 05:10, Jakeandjenn21
7. describe two strategies that parents can use to cope with stress. 8. describe the three types of childcare available to families. 9. what can parents do to be more involved in their children's education at home and at school? 10. which factors should a parent consider when choosing a childcare option?
Answers: 1
Biology, 22.06.2019 06:50, dukkchild666
How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes
Answers: 2
The cycads, a mostly tropical phylum of gymnosperms, evolved about 300 million years ago and were do...
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