7 A student researching a northern forest ecosystem learns the following information about feeding relationships in the ecosystem.
Northern Forest Ecosystem
• Insect larvae feed on white spruces. .
• Shrews and snowshoe hares are prey for lynx, red-tailed hawks, and red foxes
• Snowshoe hares eat both willows and white spruces.
Shrews eat insect larvae.
• Red foxes sometimes est insect larvae.
Which food web best represents the flow of energy in these feeding relationships?
Red foxes
Red-tailed hawks
Red foxes
Lynx
LyrShrews
Red-tailed hawks
Shrews
C
Insect larvae,
Snowshoe hares
Insect larvae
Snowshoe hares
Willows
White spruces
Willows
white spruces
Red-tailed hawks
Red-tailed hawks
Red foxes
Shrews
Lynx-Shrews
7
Snowshoe hares
Insect larvae
B
D
Insect larve
Red foxes
Snowshoe hares
Lynx
1
Willows
1
White spruces
Willows
White spruces

The construction of phylogenetic trees is a mapping out the proposed divisions and common ancestors of all living species. traditionally, these trees have been built using morphological data, such as appearance and embryology. recently, it has been possible to construct these trees using molecular data. phylogenetic trees based on different types of information agree with each: that there is strong evidence of a real underlying common descent. this phylogenic tree is composed based on molecular data (rrna). what statements can we infer are true about the organisms throughout the tree? because the tree is rooted, all branches share a common ancestor. all organisms have some sort of cellular structure/organization. all eukaryotes evolved from bacteria. since the organisms contain rna, they share the same dna. if the organisms contain rna, the share the same four nitrogen bases.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.