Biology, 02.09.2019 15:00 lizziesuks
Mass extinctions have occurred repeatedly during the course of earth's history. one of these events occurred at the end of the cretaceous period, during which the dinosaurs became extinct. mammals flourished after the dinosaurs were gone. this led to a variety of generically diverse species. why did the mammals suddenly start diverging into different species after the dinosaurs were gone?
a.) most of the predators were gone and suddenly niches were available so almost all the offspring were likely to survive and reproduce.
b.) once the dinosaurs were gone, the mammals started having larger numbers of offspring in each litter to fill the empty niches.
c.) the mammals chose to move into the vacant niches the dinosaurs had occupied and change their body shapes to suit these new environments.
d.)mammals began mutating rapidly once the dinosaurs died out and were able to create new species based on the mutations.
Answers: 2
Biology, 21.06.2019 20:00
In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls
Answers: 1
Biology, 22.06.2019 04:00
Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.
Answers: 2
Biology, 22.06.2019 04:40
Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes
Answers: 1
Biology, 22.06.2019 17:30
Mr. j, age 42, is a construction worker in las vegas. he recently noticed that a mole on his face seemed to be getting larger and darker. at first he did not worry because he was in the sun a lot and assumed the change may have been caused by sunburn. after a month, not only was the mole larger and darker, but it appeared to be “bumpy.” his doctor diagnosed a malignant melanoma skin cancer following biopsy of the nevus. mr. j reports pain in his right shin that does not go away when he puts his feet up or sleeps. discussion questions 1. relate mr. j’s skin changes to the warning signs for malignant melanoma. (see malignant melanoma.) 2. discuss the normal progression of this malignancy. what is the significance of the bone pain that mr. j is experiencing? (see malignant melanoma.) 3. discuss the treatment available for this patient and the prognosis for recovery. (see malignant melanoma.)
Answers: 3
Mass extinctions have occurred repeatedly during the course of earth's history. one of these events...
Mathematics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40
Physics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40
Mathematics, 05.02.2021 19:40